What happens after offer gets accepted

[Ben M.]

Hello, I am new and working on getting my first rental property. Wanted to see what anyone else's thoughts are but let's say I found a broken down house, contacted the owner, and got my offer accepted. 

1) Where do I get a legitimate contract to give to him with inspection and financing contingency. Would it make sense to get a realtor involved even when I initially made contact with the homeowner?

2) How do I know there are no concerns with title or other legal issues...?

3) Are there any other big concerns that I may not have mentioned?

I guess these are some of the things keeping me from pursuing a property outside of a major wholesaler or realtor. It seems to me that the guidance and knowledge of realtors are invaluable especially with pursuing the first property..