Some how I don't think this is great first project idea... Shocking you friends, will turn them away (it's not so funny to be the one getting shocked). Shocking people you don't know or like, will most likely end badly for you, eventually...
If you don't know much about electronics to begin with, how will you know what is reasonably safe, and what is potentially deadly? You wouldn't want to shock somebody with a pacemaker (not something most people brag about, and yes I've known of two teenaged boys with them).
If you don't know the basics of components and electricity, you might wind up shocking yourself more often, then your intended victim. Which, of course would be quite humorous.
On this forum (use the search tab at the top of the page) there are two very long running threads. One is 'Simplest Shocker', the other is 'Stun gun', both cover this topic very thoroughly, with many ideas and examples. It should spell it out very clearly...