how much would it cost me to have you go over my usfs contract.

First, you should find a "local" (to you) attorney experienced in forestry agreements. Second, it is impossible to estimate without knowing the length of the contract. One would have to add at least one hours to get the factual background by interviewing you. The costs will depend on the experience and expertise of the lawyer you use and the legal fees customary in your area. Los Angeles lawyer fees are higher than Mendecino County attorneys, for example since our rents and costs of employees is much higher.