1. Make sure your foundation is strong and stable. If you have any structural weaknesses or basement wall cracks then all of your hard work could be wasted.
Foundation damage needs to be repaired ASAP otherwise you could end up with a lowered home value and serious structural problem.
2. Waterproofing is critical. You want to make sure that your basement has appropriate waterproofing. An unexpected flood is expensive and stressful. Not to mention it will undo all of the work you put into remodeling your basement.