First off I just want to say I would start by listening to some wholesaling podcasts and reading books on the subject.
1. Correct
2. Most often and in general people use the 70% of ARV (after repair value) minus the cost of repairs, which is something else is helpful to get good at estimating.
3. There is a lot more to this question than can be answered in one small sentence, but essentially you need an assignable purchase contract. LOTS more details to be read about on this one.
4. Most people do build a buyers list, but if you have a really good deal and know anyone who actually knows how to run numbers, you will be able to sell that contract quickly in this market.
5. Watch the contingencies/EM, again there is LOTS more details here than can be answered with one sentence.
I agree with you on that front. I have analyzed many deals I get from wholesalers only to find that they are selling at market value, at least this is true in Utah and Salt lake, and even Davis counties on properties I have analyzed over the last 6 months. I find that the wholesalers are not always great about the ARV of properties and now I am seeing most of them ask you to pay for sellers closing and your own closing, and at that rate, you are actually paying more for the property.