Move slow and consider quality! You will never regret a quality item purchase, but you will die over and over for the bad choice of being on the cheap.
Everyone has a different approach as to "what gear". So here is MHO, it's worked for us here, so it can work for you.
Start with the RME 9652 card - rock solid. Period. It isn't cheap, but very dependable.
Converter wise, (now here's the down shot) if you can live for now with the idea of tracking at 24/48 tops, get an Alesis AI3 unit. It isn't world class, but bang for the buck...it'll get you there. THAT will be the piece you will want to replace later when the funds are available.
DAW wise, I can't truly suggest, as we've had our past several (including a new one being build right now) custom designed by a friend that runs a computer service company on the west coast. Then a local tech here in St. Louis that does the physical construction and software install. Sorry.
I hope this will at least get you started.
Joe B.