I would much rather buy inventory and a proper torch set-up....but
now I'm scared again.
I'd suggest you get a small disposable tank setup. Rio Grande has a
decent looking setup for about $180. The bottles are so small, the
potential risk is minimal. If you're powering a Little Torch you
should be able to solder most jewelry sized items. A #7 tip puts out
plenty of heat for silver up to a couple ounces.
Then, as you become confident with the equipment and procedures you
can think about upgrading. It depends on the volume and weight of
what you're doing.
I learned on an acetylene air setup nearly 30 years ago. It was
tough going. In retrospect, acetylene is a dirty burning gas that
just complicated the process of learning. Its only advantage is that
its cheap.... Well, scratch that, I just looked in the catalog and
its $70 more than the disposable setup.
If you're worried about leaking gas its simple...the propane has an
odorant added to it so you can smell when there's a leak. For
overnite just unscrew the bottle from the regulator. And if you want
extra safety you can buy a propane detector from an RV supplier,
I've read differing ideas on torches here, its no wonder you're
concerned. But if you're starting out, as I guess you are, start
small, get bigger, better equipment as the need arises.
Now get out there and do your thing.