There are no requirements for size. Minimum is enough room for one person to do a kata in. Many of the dojo in Okinawa are only three or four tatami mats. Ideally there is enough room for a class of ten or twelve students to observe the teacher and follow along on a kata.
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Dojo is a Japanese word which means "the place of the way". It is the training hall where you study.
Indeed, there you will find many dojo that teach various systems (Karate-Do, Judo, Iaido, Kendo, Jujitsu, Kenjutsu, Ninjitsu, Aikido) and styles (Shorin Ryu Karate, Goju Ryu Karate, Shotokan Karate, Wado Ryu Karate, Kyokushin Kai, Yoshinkai Aikido) and many non-Japanese Martial Arts like Kung Fu, Escrima/Arnis/Kali, Silat, Mixed martial Arts, etc. The question really is what art/discipline will suit you the most. I recommend asking more refined questions, and that way you may be able to discover what art might be more suited for your personal interests Sport, Discipline, Defense, Mind-Body Connection, etc. It is always a good idea to get introduced to the dojo through contacts or instructors. Showing up at the door unannounced is never a good idea. Most are very generous with those that show the right courtesy and respect. Also the Japanese were very wise by bringing forms of martial arts from China and Okinawa.
Karate all the way. i know i do karate and have done a couple others. karate is the best.
There are tens of thousands of karate students in the US alone.
* Shuri ryu Karate * Shorin ryu Karate