Ask who pays which fee and confirm the current amounts on the USCIS fee schedule rather than relying on a figure someone remembers. Costs differ substantially depending on whether the applicant is admitted at a port of entry or the employer files a petition, and credential and licensing fees sit outside the immigration budget entirely.
Separate the immigration fees from everything else
Three different budgets get confused with each other. The first is the immigration cost itself, which depends on the route chosen: presenting at a port of entry as a Canadian citizen involves a different set of charges from an employer petition filed with USCIS, and current amounts belong to the published fee schedule rather than to anybody's recollection. Ask the employer directly which route it intends and which charges it will absorb, since firms differ and the question is rarely volunteered.
The second budget is professional: credential assessment, licence applications, state board fees and any examination the state requires before plans can be signed. None of that is refundable if the immigration step fails, which is a reason to ask about sequencing. The third budget is the household's own: relocation, temporary accommodation, the cost of keeping a business running in Erin while the family is away, and the possibility of a return trip if an application is not approved on the first attempt.