Hi Chris,
Everyone starts as a noob, so don't feel bad! I'll weigh in on a couple of your points.
Commercial loan terms - not all commercial loans are the same (10 years with amortization). You can get some great, long-term financing from Fannie Mae, Freddie Mac, or HUD (40 year amortization!) once you're looking for a loan $1M+. If your loan will work out to be smaller than that, local banks are more the typical route.
Pre-payment - it is true that commercial loans are less flexible that residential (1-4 unit) loans. One of the big differences is that commercial loans typically carry a pre-payment penalty, meaning you're disincentivized from paying the loan back early. Shorter-term financing is available, and is generally more expensive, if you want more flexibility.
I'll leave it up to some more experienced investors or potentially a lawyer on the "when to create an LLC" question, but in short, you always want an LLC for a commercial loan (lenders will require it).
Hope some of this is helpful!
- Tim