don't confuse soundproofing with having a good acoustic environment. You could have a perfectly soundproofed room but it could still be a lousy recording environment.
I'm going to disagree with Jim here, I think environment is the most important thing. You could have the best mic, best recorder, best everything in the world but it can only ever be as good as your source. If your recording environment is poor your microphone recordings will reflect that and your monitored mixes will suffer too (the best monitors in the world will not compensate for bad acoustics). I accept that all the things mentioned are important but if I were starting from scratch I would be mindful of getting the room as good as I could.
So you would buy a Rolls Royce body and put a reconditioned Fiat Uno engine in it?
I stand by my original suggestion...learn the basics first. Start with mastering the use of the basic recording equipment and learn how to use the hardware and software then start working your way up by upgrading equipment and software.....once you have decent equipment and knowhow then maybe it is time to think about environment and sound reflection etc. The best sound environment is useless if you have only cheap basic gear and little knowhow in how to use it.
Did you hear about the guy who soundproofed his bedroom to turn it into a studio....he ran out of money before he could buy any recording equipment.....and he lost interest completely when he found out how expensive pro equipment was and how difficult the Cubase learning curve was..