Talk to local agents and investors and see where in the area a househack may make sense (won't be easy to find around Boston, be prepared for that). 

Particularly someone who I could open a line of credit with to make it easier to fund the repairs on projects without tying up my cash.

Aside from a down payment on a home and money I can afford to take from my weekly pay, I will be probably paying for most things on credit for the first flip.

I have an LLC, and my bank is offering a line of credit to my LLC. 

I hate to be the barer of bad news but financing you very first flip is one of the very worse things you could do simply because of murphy's law and if anything goes wrong with your flip you are still on the hook for paying back your loan and once you get a black make on your credit it will take years to erase that off your record if at all.

Now I guessed my interest rate using my my credit score and a few websites so I don't think that is the best way to get them and if anyone can give some insight on how to get more realistic rates I'll really appreciate it and ill refine the report.

A third party appraisal usually has to be done and then the appraisal created, the title company also has quite a bit of paperwork to complete.One option would be considering a personal or business term loan/line of credit so that you have cash in hand to play with the cash buyers.

So far I haven't been able to find a bank or credit union who's willing to put that on paper with one of the biggest factors being my self-employed status and only having one years worth of taxes at the moment.

Shop within your credit limit, so to speak.For your investors:"They'll get a higher return due to the lower management fee." 

Or, go further into debt trying to take care of these issues... which doesn't help either because then you are now paying down that debt (credit card or what have you) and your mortgage/other expenses.