I live in California but invested out of state to build up my cash flow.

Maybe you partner with a rehabber or wholesaler to build up your liquid funds. 

You want to build up the reserves for when you do need that new roof/appliances down the line and you can't be sure you won't get a bad tenant in that trashes the place so better to start saving that.Ohh another Tip on the duplex design that I got from a member.. in your design have the entry doors for each side as far from each other as you can.

Develop a budget that accounts for possible investment costs, save for a down payment, and build up solid credit.Establish relationships with mentors, real estate experts, and other investors.

Never used that rules nor any rules set by the gurus and somehow build up a portfolio that allowed my to exit the corporate world.I find those rules are an obstacles for my clients and slow them down from achieving their dreams.Its better to come up with your own rules based on your personal goals & strategy.

You could flip houses to pay off your personal residence quickly or just build up rental income to pay off your personal residence quickly. 

Attend your local REI meetups to build up a strong network and feel free to reach out and connect with everyone in the community.

I am reaching a point where I am starting to build up some cash, so I am looking into ways I can invest it and increase my cashflow for years to come!

All of you in the same boat need to continue to build up your money and for the time being learn more about RE investing and educate yourselves.  

As Jessie mentioned you should try wholesaling to build up the cash for your first investment property.Always ask for seller financing and this might be something you could keep for yourself as a rental.