@Willie Morgan make it easy on yourself and just download the contracts off BP... You can revise and taper to your needs or buy the cd at staples and you'll have tons of contracts. If you go through an attorney for your deals they should look over it and make sure you have all that you need. If you're worried pay an attorney to write up a wholesale contract for you.
I've used the ones off the CD, the NC contract and the BP one. All work fine. Just make sure you have your contingencies in place.
For rehab costs I've learned a quick way to gauge costs is scale from about $7-$12 per square foot. 7-8 good house, 9-10 decent and 11-12 needs work. Anything else is complete rehab. For example 1450 sq ft house in good condition (1450 x $7) and I add 2% of average comp ARV (just in case). Then typically I'll give a range low to high. Every buyer is different in the fact they want different things in the house or are particular about certain things. This gives me room for a range of buyers.
Anyways hope this helps and I didn't confuse you anymore. Can't wait to hear about the first deal!
"Feed your faith, to starve your fears and doubts"