What type of martial arts should I do?

It depends on what you want. BJJ is primarily a ring sport, as submission holds aren't much good versus multiple opponents. MMA is a good, eclectic martial art, but you may not be looking for either of them. If you want to be secure on the streets and learn high quality self-defense, I'd recommend MMA, classical Jiu-Jutsu, or Hapkido. If you want a competitive sport, Taekwondo, Kickboxing/Muay Thai, or BJJ are probably the best ways to go. If you want to look like you fell out of the Matrix, seek out a Wushu or Taido master.

Well check this place out (convenience is always a bonus). How is the instructor? Things usually follow his lead. Is he knowledgeable? Approachable? Does he answer questions?

What's the atmosphere like in the gym. What's the attitude of the members (on and off the mat). Are they overly aggressive when rolling? Do they take care of people? Do they help the new guys, or just practice submissions and sweeps on them. Etc.

What kind of MMA are they teaching? Do they teach something street-worthy, or is it strictly for competition? It depends on what you want.

BJJ is fun, a great workout, and (if you stick with it) will give you a good base for competitive MMA. It doesn't deal with weapons or multiple opponents.

What's their stand-up system like? I'm guessing it's either kickboxing or Muay Thai. Same questions.

Good luck and train safe.

BJJ , Olympic-style wrestling and Judo are good styles for mat work. That's part of what you need to know for self-defense and MMA.

Muay-Thai, boxing and Akido are good for in-close fighting when you're standing up.

Karate, Kung Fu, and Taekwondo are good for defending against multiple attackers and striking opponents from a distance.

I do martial arts taken from the Korean style of military hand-to-hand combat fighting. I'm being tested to get to my next belt this month :D but right now i'm at the first belt, a white belt, and the kicks are simple but very etched out so you can't do them sloppy. We do push-ups on our fists, sit ups, endurance training like crab- and bear-crawling across the room, and balance training with stances [basically you hold a position with your legs, like reaching your foot up and tucking it behind your other knee]

If you've never done anything martial arts related before, I'd do the korean style of martial arts because you start off slow but before you know it you will be able to do awesome kicks!

If you want to be a better fighter, then learn a fighting system.

If you want to be a better person, choose a real martial art.

There are HUGE differences between fighting systems and martial arts.

MIxed Martial Arts (You learn a lot from many different styles)

Ultimate Fighting (REALLY INTENSE)

or Judo which I personally think is really good

Learn as much about many different martial arts as possible, then figure out what works and what doesn't.

do whatever you feel you will enjoy.

be careful if they start giving you ^&% of fights go to the ground stats.

those stats are generalisations and are inaccurate.

try something with a good range of techniques.

if there is lots of blood staining the floor and splattered on walls theyre doing something right. this is wahyt my old chinese master said when i was studying under him in hong kong in the 1980s and considering coming home. luckily i chose to continue under the old man

Do mixed martial arts,you get very skilled.