Hello BP, sometime ago i read "The definitive guide to using seller financing to buy real estate", and only thought that to prevent due on sale clause, that would mean i can only used this method on debt free property.

I use 1.2% as expected rate in CA as a rough guide.  

Its an absolute wealth of valuable RE investing info.For the matter I am a local Miami investor.

Be sure to check out “Learn” for all kinds of useful resources and free how to guides.

As far as buy and hold, I would recommend Jeffrey Taylor's The Landlord's Survival Guide as property management is critical to buy and hold. 

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meet Set up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alerts Read Beginner’s Guide: http://www.biggerpockets.com/real-estate-investing Check out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/Wishing you the best! 

If you are interested in finding Mentors, I recently wrote "The Ultimate Guide to Finding Incredible Mentors" - check it out!

The long term plan would be to develop it as the city expands and the land becomes more valuable.

Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meet Set up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alerts Read Beginner’s Guide: http://www.biggerpockets.com/real-estate-investing Check out BP Podcasts: http://www.biggerpockets.com/renewsblog/category/podcast/ If you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

There is so much valuable information there waiting for you.