Need help with figuring out Ultra Ultra small HOA

Hello all, I am new to this site and new to HOAs altogether. For Background we are part of a two unit Condo HOA. The owners before us kept no records of anything and just split the bills(Water/sewer, Garbage, and Insurance) when each bill came. The other unit's owner just got forclosed on and left us with a mess of no real info. We are first time homeowners ourselves and did not realize what a mess(organizationally for the HOA) we bought(albeit for a great deal). We do not have a copy of the bylaws (can't even figure out if any exist) and don't know where to get a copy. We bought our side as a pre-forclosure so the owners before us were not very cooperative with HOA info. We are not sure how this is all going to pan out when her Bank takes ownership officially of the other unit. We just want to cover our back sides and make sure all the condo bills get paid.

Any advise or suggestions on how to learn to self run this HOA would be greatly appreciated.

Thanks, Susan