Well, you should probably decide what you want to study before thinking about visas. Some colleges can sponsor Tier 4 and some can't. You'd need to check with the college to see if they could sponsor you. However I'd suggest starting by contacting the university and see what they would require from you for the course you want to take. Universities will be much better equipped to sponsor visas than colleges, on the whole. If your current qualifications aren't enough, the uni might offer a foundation year and sponsor your visa for that.
If university is your goal, you should start there and work backwards.