Honestly, one wholesale per year will cover the corporation fees and accounting fees.

Am I obligated to let them know of my intent to sell?

For real estate investing, should I form an LLC or a corporation?

You are obligated to attempt to mitigate the damages by trying to find a tenant to move in and pay some of April's rent. 

(Assuming you do everything correctly and do not allow the corporate veil to be pierced.)Here is another scenario where the LLC will help protect you: If you are a sole-proprietor (no LLC) and a UPS driver slips on the wet lawn of your personal residence, hits his head on a rock and dies, his estate/heirs will sue you for $10 million or more! 

Based on your experience, do lenders typically run numbers with people with no obligation to move forward ( as in i don't want a credit run just yet, and I don't have a specific realtor or lender that I'm looking for yet, simply because i know I'm not in that position yet..

If you don't have kids and life obligations the construction site mess isn't that bad.

If you submit the offer without the financing contingency, yes, you are contractually obligated even if your loan does not get approved, and could lose your earnest money if you back out.

My husband met him, and they talked about it. 2 days later corporate calls my husband and says "lets meet".

College education is usually a requirement, if you want to climb the corporate ladder and are looking for a W2 career in management.