As a student (you must be 12 years or older and when under 18 a parent must sign you up), you are able to watch instructional videos at your own pace, complete assignments whenever you can, and do an exam when you think you are ready. You can upload videos to do an exam and you can share your videos with other Aiki-jutsu-do students if added to your friends list. Material is limited to the level you are at until you successfully pass the exam for that level. Upon passing an exam, the material of the next level becomes available. There is no time span set for any level, so you can go as slow or as fast as you can. Practice as often as you like and whenever you can.
Yes, an important question of course. It's $15 per month via an automatic subscription. The first month there is a registration fee of the same amount so the 1st month it's double. There is a good reason for it which you will learn about later, or your referrer may have explained it.
If you are aware of any medical issues, consult your medical doctor first.
Flow as a river
Move like a wave
Stand like a mountain