I HATE paying anyone in cash -- it's too hard to track for accounting purposes.

I have an auction calendar on my website where i keep track of the hyper local auctions occuring, date/times and deposit amounts.

Finding off market homes isn't a walk in the park- it takes a lot of time and persistence tracking down the sellers and getting offers accepted.

How well to you keep track of your spending and saving as of now?

You can very easily track whether or not you're making money by keeping the accounts separate.

Do you have a preferred method and format for keeping track of all of that information?  

it sounds tedious but it sounds like it will be easier to keep track of what is happening with each property.How hard is it to set up a series LLC ?

Good luck on your REI career, I would recommend you check out some of your local REI meetup groups as a great way to fast track and network in your area.

I am a cash buyer, but the deal isn't for me as the profit is a bit lower than what I typically invest in.The idea that I have is to place the property under contract, be sure the contract is assignable, find an end buyer (not investor) and assign the contract to them and include my fee in the price, aka wholesaleI have no experience in this, but I feel this would be the best approach given the situation.Am I on the right track?

If you track yields and cap rates as well as grm and noi/unit you will get a better feel for where the market is and is going.