martial arts training

[PWHerman]

I've seen a lot of threads on martial arts training here, and there really seems to be a lot of people here who really know their stuff.

I've been thinking about taking up a martial art. I'm not going to ask which one should I take because I think that topic has probably been beaten to death but I do have a few questions if anyone could help out.

First, how much does it cost to get good training? Secondly, how often should you train every week? Finally, how can you tell a good school from a bad one?

Any help that could be offered would be appreciated.