Chris,Remember that getting a HELOC on your primary residence now means that you are putting your HOME at risk for your investing.  

Remember the 3 F's...be Firm, Friendly and Fair.

Once you have your Heloc, just make sure you remember to be very conservative with your flips and you will make money.

Video Games Are Often Hated On and this doesn't help in terms of your real $100, but I would point out that most of my (also millennial-age) friends who are entrepreneurial souls got their start in MMO (basically means people playing together) video games online where a vivid "marketplace" economy allowed your character to work in trades, sell goods, and make profits.

Ben Ballinger also remember you will be using more water in each unit.

Remember, what most people call B properties are really C (which is not all together bad).  

I should remember that it's my house and I can do what I want.So, I'm going to sell it.

Remember that phrase, when you are dealing with home owners, or you will get discouraged with these people.

I think there is also another option but I can't remember it. 

I remember in 2006/2007 when many people said "but real estate always and only goes up".