About to start my first direct mail campaign, would like any opinions on it. 

We do not represent private landlords or owners directly.

@Brittaney Krischke - Go through all this and you'll be an expert wholesaler at the end (in theory; the practice is a whole different story):https://www.biggerpockets.com/blogs/7276/47735-the-ethics-of-wholesalinghttps://www.biggerpockets.com/blogs/5101/47691-wholesaling-tips-with-tic-tac-toehttps://www.biggerpockets.com/blogs/5101/47552-wholesalinghttps://www.biggerpockets.com/forums/517/topics/345427-white-paper-wholesaling-101-direct-mail-based-on-bp-postshttps://www.biggerpockets.com/blogs/6539/44228-wholesaling-is-illegal---no-really-it-is--at-least-in-my-statehttps://www.biggerpockets.com/blogs/4430/54368-guide-to-automatically-wholesaling-over-20-deals-a-monthhttps://www.biggerpockets.com/renewsblog/2009/12/17/wholesaling-houses-faq/https://www.biggerpockets.com/renewsblog/answers-top-5-questions-asked-aspiring-wholesalers/https://www.biggerpockets.com/forums/12/topics/586478-questions-to-ask-a-lawyer-before-wholesalinghttps://www.biggerpockets.com/renewsblog/2009/11/26/10-questions-investors-adding-wholesale-buyers-list/https://www.biggerpockets.com/forums/12/topics/588362-questions-to-ask-potential-sellers-for-a-wholesale-dealhttps://www.biggerpockets.com/renewsblog/2009/06/24/answer-subjectto-questions/https://www.biggerpockets.com/forums/93/topics/590614-what-are-the-top-key-questions-to-ask-seller-when-contactedhttps://www.biggerpockets.com/renewsblog/2008/07/30/the-single-most-important-question-to-ask-when-negotiating-with-a-seller/https://www.biggerpockets.com/forums/93/topics/588666-have-questions-on-wholesalehttps://www.biggerpockets.com/forums/93/topics/595659-wholesaling-advice-and-questionshttps://www.biggerpockets.com/forums/93/topics/601390-rei-questions-for-wholesalerhttps://www.biggerpockets.com/renewsblog/wholesaling-questions-answered/https://www.biggerpockets.com/renewsblog/2015/05/12/questions-about-closing-wholesaling-deal-get-answers/https://www.biggerpockets.com/forums/93/topics/591896-so-many-questions-about-wholesalinghttps://www.biggerpockets.com/forums/517/topics/595564-ask-me-about-multi-touch-direct-mail-campaignshttps://www.biggerpockets.com/forums/93/topics/603653-lots-of-random-wholesaling-questions-from-a-newbiehttps://www.biggerpockets.com/forums/517/topics/602974-138-leads-in-28-days-in-the-houston-texas-area-ask-me-anythinghttps://www.biggerpockets.com/forums/585/topics/608176-probate-leads-how-to-find-them

They are also working many listings at one time and have to work within their client's directive.

Does anyone know the answer to this or direct me to the right person to ask?

Wholesaling, you are going to be spending a lot of time building a buyers list, pursuing leads, buying lists, direct mail, cold calls and possibly door knocking to find off-market homes to get under contract, and then sell your equitable interest in that contract for $5000 to $10,000, depending on your market.Multi-family, you need to look at what you can afford, where you can raise money, an that will determine how many doors you are going to get (a duplex, fourplex, 8 unit, 24 unit..etc.). 

I find it easy to use and, since the information comes directly from the "big data" companies, I found the information to be accurate.Plus, a lot of the mail companies that offer lists use Listsource as a provider. 

We set up the background and credit checks for them to go in an provide there SSN directly with that 3rd party then the report comes to me.

I agree, but the vast majority of 401k plans don't allow direct investment into real estate.

I bought a house with a lease/purchase option and a portion of the rent went to the down payment.