I have been looking at old pictures and I have repair bills but should I just mark unknown for the items I can't verify?

You have to earn a monumental return to compensate for the risk of sending money to an unknown you discover online.

The process starts with setting up a support network of professionals who can help you analyze undeveloped property; as there are significantly more unknown factors in play with vacant land lots than with those which have already seen development.

Repeat  Again, risky with unknown market.Wait for $50K to grow to 100-150K.  

It's too much work, there are too many unknowns and I don't want to get stuck with a house that won't sell.Wholesaling is not the easy money that's being touted by these people online.

If this were a transaction with someone closer to me or a long time customer/client relationship that would be different, but for a simply transaction with someone unknown to me I would be firm. 

Going from the unknown of what is possible to learning how to unlock financial tools that are available. 

I realize most people want to stay away from LH properties given the unknowns and variables. 

SEO (Search Engine Optimization) seems to bring up a lot of unknowns to many investors who are interested in building their website and online presence.

Yes they are generally more expensive , but the work is usually done right the first time , within schedule , and at the contract price  ( as long as there arent unknown problems) .