It is better to negotiate Extensions up front when you are applying for the loan.

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NoOhio Revised Code4735.01 Real estate broker definitions.As used in this chapter:(A) "Real estate broker" includes any person, partnership, association, limited liability company, limited liability partnership, or corporation, foreign or domestic, who for another, whether pursuant to a power of attorney or otherwise, and who for a fee, commission, or other valuable consideration, or with the intention, or in the expectation, or upon the promise of receiving or collecting a fee, commission, or other valuable consideration does any of the following:(1) Sells, exchanges, purchases, rents, or leases, or negotiates the sale, exchange, purchase, rental, or leasing of any real estate;(2) Offers, attempts, or agrees to negotiate the sale, exchange, purchase, rental, or leasing of any real estate;(3) Lists, or offers, attempts, or agrees to list, or auctions, or offers, attempts, or agrees to auction, any real estate;(4) Buys or offers to buy, sells or offers to sell, or otherwise deals in options on real estate;(5) Operates, manages, or rents, or offers or attempts to operate, manage, or rent, other than as custodian, caretaker, or janitor, any building or portions of buildings to the public as tenants;(6) Advertises or holds self out as engaged in the business of selling, exchanging, purchasing, renting, or leasing real estate;(7) Directs or assists in the procuring of prospects or the negotiation of any transaction, other than mortgage financing, which does or is calculated to result in the sale, exchange, leasing, or renting of any real estate;(8) Is engaged in the business of charging an advance fee or contracting for collection of a fee in connection with any contract whereby the broker undertakes primarily to promote the sale, exchange, purchase, rental, or leasing of real estate through its listing in a publication issued primarily for such purpose, or for referral of information concerning such real estate to brokers, or both, except that this division does not apply to a publisher of listings or compilations of sales of real estate by their owners;(9) Collects rental information for purposes of referring prospective tenants to rental units or locations of such units and charges the prospective tenants a fee.

So I really want to get started rehabbing, should I make an S Corp before I even get started rehabbing, before I apply for a hard money loan?

This policy may be applied to refinances of a subject rental property or to other rental properties owned by the borrower.

anything you pay above the monthly mortgage payment goes directly towards reducing your principal balance (the amount left on the mortgage).Even if you have cruddy credit, you can apply for a mortgage, you'll just get a high interest rate. 

The FHA says that you have to screen all prospective tenants equally, and apply your criteria equally.

LLC formation: and get Employment Identification Number (EIN) and then apply for ITNS.

You could consider taking a second job for a few months and then applying for a mortgage. 

The last 3 scores were provided to me by Wells Fargo when I applied for a conventional mortgage two weeks ago.