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And I agree with Naruta

I can't believe she is the only one that answered your questions. And I agree with what she said U_U
You can make your own character (also called custom bios)
If you click ---->
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<----- you can see the list of sensei's / sempais who are able to teach and also what they can teach.
NOTE: Some sempais and sensei's on that list no longer RP/are no longer active so check when they were last online and also check their profile message. Most if not all will have a message saying what they can teach/when/how/etc. So click on their names and it will take you to their profile and you can ask them there. Also be careful because some sempais/sensei's wont take students if you ask/have permission from their sensei.
You must also have 50 post before creating a bio so you can start RPing. No bio=No training. No training=No Rp
Once you get 50 post you can go ---->
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<------ and create a bio by using this ----->
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<------
Be sure to read the Basic RPG Character Bio Rules ---->
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<-----
I hope this helps and I hope you have a great time RPing ^_^ It's really fun once you get started so if your stuck on something just ask around and I'm sure someone will help you with whatever it is you need (as long as its reasonable).