Step 1: Gather materials
Alternatively, you could use 316L for the bar. I've made quite a bit of stuff from titanium and in small sizes it's pretty much like working 316- I don't see much reason not to use the titanium and some people may have reactions to the small amount of nickel in 316.
I love using recycled materials for projects. I'm always grabbing scrap metal out of trash and my basement is, well, let's say it's full. This is one place where scrap materials are a really bad idea. For piercing jewelry I would only use 316L stainless, titanium, or gold. Use new materials from sources that know their stock. 'Stainless steel' rod from the hobby store or home center won't cut it, and is probably more expensive than buying good stock from a metal supplier. Anything else is risking nasty metal reactions and infections. The right stuff is not very expensive- all these materials should run under $10 and give enough for 5 or 10 pieces of jewelry.