Continue growing portfolio

[Doug Cairns]

Hello everyone. I am a Real Estate Rookie and just getting started. I wanted to find out how to scale growth and continue to add more properties to my portfolio. 

I took out a HELOC to pay for the down payment on my first 2 properties (Still under contract).

I am putting 25% down on each so I have built in equity.

These 2 properties are already rented out and I should clear about 200/month each after Mortgage/Insurance/Management/Taxes/etc.

I would like to replicate this process again in the next 3 to 6 months. 

Is it even possible or am I being un-realistic in my timeline? Should I wait a year or more to build more equity in these properties and then do a cash out refi or take out a HELOC on those properties?

Ultimately I would like to be able to acquire at least 1 property per year minimum, more would be better if possible. 

How have you guys continued to scale your growth?

Thanks for any and all replies.

Douglas