Feedback Please!!!

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I would really appreciate any and all feedback on my newbie understanding so far!
MY areas of interest-Whole to start, then rehab and sell and or hold.
A. Wholesale- Find desperate sellers ie: pre-forclosure- Network-loss mitigaters, NOD's , lis pendens, tax liens, 1000's of business cards, flyers, signs, adds etc. Be the first one there and offer a sound solution! Get estimates on repairs fast. ( I am a contractor so this part could be done pretty fast), if the numbers work ie: (65-70% of RMV for a quck sale, less repair costs, less ???%, room for the investor for a couple of months hold and rehab time and sale fee's??), GET THE HOUSE UNDER CONTRACT, assign the contract to an invertor-rehabber for a fee, depending on the room in the deal? I would hope 5k minimum on 200K??
B. RE-HAB-FLIP- Locate deals, same way as above, get HML,close, rehab, flip at say 10-15% under recent comps for a FAST SALE, move on to the next one??
C. Buy and Hold-rent?Lease option, rent to own after rehab??
Locate the deal, same as above, (HOW DO I FINANCE IF HOLDING)?? I would not think HML, but convetional, right? Rehab the prop-RENT IT or, for OWC sale, do rent to own or lease option, with a down, a premium sale price as well as higher interest for owner carry??
FINAL QUESTION: Are auction props much riskier? Cant see the inside, need cash or line of credit-etc.-But, I know of a Real Estate Co. that does this on a large scale and the 2 partners are filthy rich! They use their own full time agents to sell the properties. I am trying to understand how they do it?? They also owner carry problem properties.
They are listing about 30-50 properties at any given time!