jamesworley,
Sounds like you're getting basics under control. You got your filter working, pump working, so you have circulation and no leaks. Did you ever find or replace skimmer lid and skimmer basket? If not, you're going to want them. The basket will prevent something from getting lodged in your plumbing. The lid prevent something (or someone) from falling into the skimmer.
There has been a lot of responses on this thread, some maybe confusing. Just continue to follow the links zea gave you in the beginning and you'll be on track. Those methods are tried and true that have helped numerous people get their pools from green to sparkly. One of the nicest things about those methods, is that they are very straightforward and easy to understand.
One last bit of advice, keep a close eye on the filter pressure. It can go up really quick when clearing up a green pool. I know it says that in those links. I just wanted to reinforce it, because it can be surprising how quick it can go up.
As always, if you have questions please post them. Oh yea, we love pics here, looking forward to seeing your pool go from green to sparkly.