This was my original love! I'm trying to get back to it now, actually, to sell on Etsy.
There's quite a few different types of jewellery making, ranging from stringing beads and adding a clasp, to complex bead-weaving, through wire work and silversmithing. If you want to make jeweller's grade jewellery, or work with silver other than wire or PMC, look into taking a course at your local art college - the techniques are best learned in person. If you're more interested in working with beads and wire, there's plenty of great resources out there!
Here's some to get you started:
This site has great patterns for jewellery and beadweaving :
To learn the basics of beadweaving:
Particularly look for peyote stitch and square stitch - they're the easiest to learn and the most versatile (brick stitch is also very popular, although I hate it - have never got the hang of it!).
If you have any questions or get stuck with anything, give me a shout, I'd be glad to help out! I'm beading all the flowers for my wedding (sculptural peyote, herringbone and square stitch) and love working out new things :-)