You can get quickbooks online which I presume would be independent of the operating system you use.

I'm still relative new to REI and I'm not aware of the best options out there for financing a multi-family.The property price is around $150k and I'm going for a 25% downpayment.

You can use this HELOC to fund future investments.Before you go buy that big, fancy, expensive “forever home” consider buying a 2-4 multi-family property with an FHA loan or some Live in flips.  

I would start by reaching out to an agent (perhaps go to your local REIA and ask for suggestions) and ask them to send you multi-family listings.Also, make sure to brush up on your deal analysis, so you can jump on a good deal when it comes along. 

I am 27 years old looking to buy my first property, a multi-family property, next year.

Stick with defaults.HVAC systems are a pain in the ***.

“Plan” is to Fix-N-Flip for 3-5 years and build a warchest with the long-term objective of acquiring multi-family properties for long-term income and wealth-building (for my partners, my children, and their children).  

Systems makes things cheaper.  

I have my first Boston multi under contract and am working on interviewing PM's.  

Str’s, spec house, local rental, out of state rental, all cash buys or leverage myself as hard as I can, multi-family or sfr.