I'd reccomend having a good look around here, there are afew threads made by new starters like this, with lots of good tips in them.
BCLG and Tubby Rower's threads are both still on the front page, full of good advice.
A couple of linkys too:
http://wiki.hattrick.org/Main_Page (alot of this is covered on the site but is still good)
http://www.hottrick.org/node/4 - the platypus guide useful read for a beginer.