**** use it as a wire feed now till you can get your gas up and running. Get ya some .030 and .035 tips and self shielded wire and use it. Better yet make sure it works before buying too much stuff.
Once you know it’s ok you can pick up a bottle hose and regulator. You can get those at any LWS. As for a cart, nobody says you really even need one at all so don’t be in a rush if the $$$ are tight.
When it comes to bottles typically you will get raped to fill small ones. So with that in mind if you are going to be using much gas get the biggest bottle they let you persally own. Usually 125 cf. They seem to charge almost the same to fill a tiny bottle as the 125 so plan accordingly or get bent overe repeatedly.........