I'll do my best to keep this brief for you.
Currently you are in what I call the prep phase. This is where you're planning, gaining knowledge, establishing relationships, and getting ready to dive into the game.
These are the things I would be focusing on in the meantime;
1. Build your network. Get in touch with investor friendly realtors, speak with mortgage lenders who can guide you through what needs to be done to get an approval, familiarize yourself with the local Property Managers/Flippers/Wholesalers, and start talking to other investors in your area. Attend the local REIA, get in the FB groups, meet for coffee etc.
2. Learn how to analyze a deal. Understand purchase prices, scopes of work, getting comps for ARVs. Get to know the terms cashflow, cap rate, cap ex, noi, dti... Basically get familiar with how you can run numbers on a house to get to what your best possible offer could be.
3. Check NAR and FreddieMac at least weekly and go over some of their blogs to get a sense of where the market is, where it's going, and so on.
In regards to your last questions, you may as well call a local lender and ask them. Good ones will tell you and help you prepare for when you're ready to buy.