Advice for a C-Corp acquisition with some retained equity for sellers

Hi - I'm looking for some advice on structuring a deal for a c-corp. I'm unfamiliar with many of the legal/tax nuances that come along with a C-Corp, so hoping there's someone who's willing to elaborate on considerations I should keep in mind while negotiating purchase price and structure. A few notes: 1) they've been carrying forward some NOLs from 2020; 2) there are 3 key employees that are minority owners that may want to keep some equity. Some specific questions I have:

1. Asset vs stock sale - beyond the standard difference of these two transaction types (e.g. liability, step-up in assets for depreciation), is there anything specific to the entity being a c-corp that I need to keep in mind? The seller has specifically mentioned he doesn't want to do an asset sale because of the tax implications, but could the NOLs offset some/all of the tax liability if we were to do an asset sale .
2. Company structure - might be related to the questions above, but what are the pros/cons of keeping as a c-corp vs converting to an LLC?
3. Retained equity - what do I need to keep in mind in the event that one/all of the minority owners want to keep their ownership %'s (all under 10% individually and under <20% in aggregate).
4. SBA financing - anything I need to keep in mind as it relates to debt financing if I wanted to use a 7(a) loan?
5. I'm sure there are other key questions related to the selling entity being a c-corp that I should be asking so let me know what other info I should be asking the seller that could make a material impact on deal structure