addict i wrote out some guidelines in my own words from a past future music magazine for programming trance basslines, if your just starting out then use a synth thats user friendly, theres plenty of free synths out there try get hold of triangle from rgc audio or any some other user friendly synth.

1.Detune 2 square waves by + & - 3, then drop filter cut-off so it is nearly closed. Next, raise the reasonance so it begins to self-oscillate then roll back the reasonance control so its just before self-oscillation. Set both the amp & filter envelopes to a zero attack, sustain & release and set the filters attack to around ¾. Finally set the amps decay to around the mid-way point, and then try playing around with both the filter cut-off & the amps decay setting to construct different settings.

2.Start with either a sawtooth or square oscillator. Set the amps envelope to to a zero attack with a fairly short release and a medium decay and sustain. Use these same settings on the filters envelope, and set the reasonance just short of self-oscillation with a low-filter cut-off. Its worthwhile playing around with both cut-off & reasonance, along with the filters envelope to acquire the sound you need.

also if you havent started buying computer music (monthly), get down to the newsagents straight away, and buy a copy, get it every month, a beginners special has just passed order it.

in the magazine theres lots of tutorials, reviews, plenty of features, it also has tutorials for all the best seqencers, and soft studios including fruity loops, theres also a cover cd with every issue, with free software(some of it is very good) there are also demos with only slight restrictions, not to mention a libary of software and samples, every single month.

also try this website its ram packed with tutorials on music production:
www.intermusic.com(look for tutorials)

hope this is some help to you, good luck!