You can buy Ephedrine OTC in Canada, don't know about elsewhere... There are pretty strict rules about doses/marketing but it
is available.
Errrr, anywhere from 20mg up feels good. I'll usually take 40-60mg with a couple red bulls or "wake up" caffeine pills when I do it. Any more than that and I get too jittery.
Goes good with a joint. I dunno. Hit up erowid and google etc before you use it. Stimulants can be dangerous. That's why they can't sell this stuff as diet pills anymore. Bad new bears.