Government charges come from the USCIS fee schedule for whichever route is used, but the larger variable cost is evidence: obtaining client letters, translating French contracts and possibly a credential evaluation for the DEC. Budget the evidence first.
Spend on the proof the rule actually asks for
An experience case costs more time than money, but both should be planned. Translating French-language client contracts and tax schedules into English is often the largest outlay, and it should be limited to documents that carry weight: a two-page engagement letter matters more than a fifty-page brand guideline. A credential evaluation of the DEC may help an officer unfamiliar with Québec's college system, though it is not always required; ask before commissioning one.
Government fees differ between a port-of-entry application and an I-129 petition, and premium processing is an optional extra with its own charge, so confirm each figure from the current USCIS fee schedule rather than an older quote. Ask any professional adviser whether the fee covers preparing the experience table and responding to follow-up questions, or only reviewing what the applicant assembles. Keep relocation, housing and the spouse's separate planning on their own lines, since none of them changes eligibility.