I'm new to Twitter and I need some pointers on how to get started?

[Penny]

I've had a twitter for a while but never really used it. It was supposed to be business related but I just neglected it.
I'm used of using facebook for social networking... So this is completely alien to me.
I need help lol. No idea how it works or how to meet people on there.
I've replied to a couple people's tweets but I'm not sure if that's bad etiquette since I'm a complete stranger?
Just some basic pointers to get me started would be cool. Just cause i'm not used of it it confuses me. I'll get the hang of it eventually, i'm sure but without anyone to talk to yet it's boring at the moment.

Anyway. Any newb tips would be appreciated.
I forgot to mention that I got the search/hashtag/following people part. It seemed self explanatory when I joined. I appreciate you answering and being helpful though, =)