how do you go about basslines?

I've tried using synths and i just can't get anywhere near the sounds I want for my basslines. (i'm a complete n00b though).

Basslines piss me off so much though (i'm that hopeless at them) so _any_ tips you can provide will me much welcomed.

(sorry if this type of thread has been posted millions of times - i've been drinking and cant work out of to use the search function so just link me up with past threads if it's been covered already):ohdear: