you should read about the process before atempting, spend a little time studying, if starting this I would look into HCl acid peroxide also called AP, then HCL/bleach muratic/bleach (hydrochloric acid and sodium hypochlorite).
these are easy processes and will get you started, look for lasersteves website if you haven't seen it yet,
study the basics, and do not forget to read up on safety.
for what few dollars you get from metals could cost many times more in medical bills or your health or life, this is not a hobby to just jump into and get started it takes time and work, but to those who stick it out and work hard it is rewarding if not monetarily then to the mind, and very rewarding when you melt that metal so hard worked for, good luck work hard and be safe.