Especially if there are any things you have done to a house that turned out to be very popular or big flops. 

Market the unit widely on popular sites to get a number of applicantsScreen Tenants ThoroughlyCredit CheckCriminal Background CheckSex Offender, Felonies, etc.Check with previous landlord referencesVerify Employment / Assets / IncomeVerify IdentityBe reasonable with:PoliciesHave a fair set of rules at the property and stick with themPricesPrice the unit appropriately in the marketPropertyHave a well maintained propertyI have found that crappy properties attract crappy tenants

Maybe we're talking about a different yellow letter, but...The premise behind the popular handwritten letter on ruled yellow paper is supposed to be that you're a regular "joe" trying to buy (or sell) a house.

You might be able to find someone to do this in return for a flat fee paid from the buyer's agent commission at closing, the remainder of the buyer's agent commission being paid to you or the end buyer in the form of a commission rebate.As for your original question, I've seen it done many ways, but the simplest and most popular way is to add "and / or assigns" after your or the buyer's name on the original contract with the seller.If there's an existing relationship with the seller, i.e. you're already in contact with them and / or they know your intent for the property (wholesaling) you're in a pretty strong position.

Any property management referrals given would rock!

Your time here will be well spent.You didn't mention a niche of interest, so I added the most popular three below, for your review and selection of one or all.http://www.biggerpockets.com/renewsblog/2013/02/22/buying-rental-property/ (how to buy a rental property)http://www.biggerpockets.com/renewsblog/2014/01/07/flipping-houses/ (step by step guide to flips)https://www.biggerpockets.com/renewsblog/2015/01/31/ultimate-beginners-guide-real-estate-wholesaling-2/ (Ultimate beginners guide to wholesaling)Now that you have made the move, below are some links that will help with the navigation of the site. http://www.biggerpockets.com/startherehttp://www.biggerpockets.com/meetSetting up Keyword AlertsHow to Use @Mentions on BiggerPocketshttps://www.biggerpockets.com/ruleshttps://www.biggerpockets.com/inviteshttps://www.udemy.com/biggerpockets-real-estate-investing-course/ (video with 64 lectures and approx 6hrs of material)https://www.biggerpockets.com/real-estate-investing (Ultimate beginner's guide to REI)Before your 1st purchase, please ensure you visit the below link for some tips.https://www.biggerpockets.com/renewsblog/2014/12/19/real-estate-investing-success-smart-tips/REI books suggested by BPershttps://www.biggerpockets.com/renewsblog/2015/11/13/7-real-estate-books-beginner-investors/ (7 absolute must read books for beginner REIs)http://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/?

These were really popular from 2003 to 2007 during the real estate run-up. 

@Diane PierceWelcome to BiggerPockets, a place to interact with a vibrant REI group, learn the real estate business and language.You didn't mention a niche, so, I added links to the most popular niches for your review and selection of one or all.http://www.biggerpockets.com/renewsblog/2013/02/22/buying-rental-property/ (how to buy a rental property)http://www.biggerpockets.com/renewsblog/2014/01/07/flipping-houses/ (step by step guide to flips)https://www.biggerpockets.com/renewsblog/2015/01/31/ultimate-beginners-guide-real-estate-wholesaling-2/ (Ultimate beginners guide to wholesaling)It doesn't matter if you are young or old, totally new or need to build upon your experience.Yes, you have just announced a commitment to the thousands in this community about your seriousness regarding REI and have taken this bold step to affirm it.Your time on this site with the BiggerPockets community will be well spent and can be financially rewarding if you so desire.Don't get overwhelmed by the massive amount of data archived on this site.Simply, bone up on the areas that you need to expand knowledge in such as, Forums, Marketplace, Learn, Network, Analyze and Resources.Feast on the Podcasts, #askbp Podcasts, blogs and webinars REI books suggested by BPershttps://www.biggerpockets.com/renewsblog/2015/11/13/7-real-estate-books-beginner-investors/ (7 absolute must read books for beginner REIs)http://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/?

Your time here will be well spent.You never mentioned a niche of interest, so, I added a few links below for your review of the most popular ones.http://www.biggerpockets.com/renewsblog/2013/02/22/buying-rental-property/ (how to buy a rental property)http://www.biggerpockets.com/renewsblog/2014/01/07/flipping-houses/ (step by step guide to flips)https://www.biggerpockets.com/renewsblog/2015/01/31/ultimate-beginners-guide-real-estate-wholesaling-2/ (Ultimate beginners guide to wholesaling)Now that you have made the move, below are some links that will help with the navigation of the site. http://www.biggerpockets.com/startherehttp://www.biggerpockets.com/meetSetting up Keyword AlertsHow to Use @Mentions on BiggerPocketshttps://www.biggerpockets.com/ruleshttps://www.biggerpockets.com/inviteshttps://www.udemy.com/biggerpockets-real-estate-investing-course/ (video with 64 lectures and approx 6hrs of material)https://www.biggerpockets.com/real-estate-investing (Ultimate beginner's guide to REI)Before your 1st purchase, please ensure you visit the below link for some tips.https://www.biggerpockets.com/renewsblog/2014/12/19/real-estate-investing-success-smart-tips/REI books suggested by BPershttps://www.biggerpockets.com/renewsblog/2015/11/13/7-real-estate-books-beginner-investors/ (7 absolute must read books for beginner REIs)http://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/?

It is a most popular strategy on BP.