What have you got already ?
Blokes tend to have tools galore lying around unused, and if they (the tools!) are in good nick and clean they may be pressed into service for jewellery making.
You'll probably need to bend stuff - there are lots of pliers out there
You may need to cut stuff - side cutters ( a bit like pliers again) will come in useful.You may need to hold things while you work on them - I have a variety of clamps, vices and engineers hand vices that I use.
Drills and Saws come in handy - but the ones for Jewellery work tend to be a bit specialised. Sharp knives can remove metal, but small files are perhaps better. For heating stuff up I often use a Cooks Torch.
But as there are so many different types of jewellery, go to any craft fayre and show an interest to the stall holders. Most will be more than happy to chat about what they do and how they do it.