Hi, Doniece! Welcome to BP!
I admire your spunk. That said, i feel the need to raise a caution. I, too, am new to REI, so keep that in mind as you read my comments. I am concerned about the number of seeming unknowns here. I assume your research on comps reflects actual sold prices, not listed prices, that they are true comparables (sq. ft., number of bedrooms/ baths, garages, etc.), and that the lender (why does seller not know who that is?) has already agreed to accept $45,000.
Wholesaling short sales, pre foreclosures, and REOs, from all I've read, is rife with potential pitfalls, financial and legal. I believe, just as an example, that banks (and we don't even know that the lender is a bank) will not allow an assignment of contract. That leaves out wholesaling unless you can afford a double closing. Even if you can manage that, I think there are minimum resale time frames, so you would have to be able to hold the property the required length of time, all the while paying holding costs. If the ARV is $60,000 conservatively, there is only a $15,000 spread which, if the seller is not estimating repair costs correctly (and they don't) could virtually eliminate any profit.
As I said, I admire your effort to take action, I just think you need more information before going further. I'm sure there will be far more educated responses than mine, and that if I'm wrong, they will teach me as well. I'll keep watching this post.
Good luck, and let BP guide you. There are some awesome resources here!