Like Vinny just said a few minutes ago, just practice a lot. You're not going to get to 30 seconds in a week, so you have to be patient. As a general rule, the more you practice, the more you will improve. Also, practice trying to lookahead. I'm not sure if you know exactly what that is if you are new to cubing, but there are many discussions on this site about it that you should try looking at. Basically, slow down your tps (turns per second) while doing practice solves, and focus on trying to look ahead to the next move you will have to do. I know that this might sound weird, that slowing down will help you get faster, and I was skeptical at first too, but it really helps a lot. I definitely improved my times when I started slowing down to look ahead. This is because you end up spending less time between moves just sitting there looking for the next move.
So, basically, practice a lot, and try to look ahead. Also, if you feel up to it, try to memorize all of the cll algs, but don't feel that you have to do this. The most important thing is practice.