Generally I encourage people to be adventurous, but I have to agree with shu on this one...without moto skills, Russian skills, or enough life experience to be able to make good decisions in dicey situations, you could be in for a rough time.

A couple of other comments about your post:
Most Russians will tell you that you'll die immediately if you try to ride across Russia. This is nonsense... And while having Russian skills would certainly make things easier and more interesting (chatting with locals, etc). it is not essential, lots of people ride across Russia every year without speaking Russian. I'd be much more worried about your lack of motorcycle experience.

I think the Pamir will be worse, not better, than Russia. It is more remote, the terrain is more difficult, etc. Let's face it, in Russia you're riding along flat paved roads for thousands of kilometers--if not for the road conditions, you could almost do it in your sleep. I've never been on the Pamir highway, but it sounds more challenging.

I don't think you'll be able to buy a moto in your name on a business visa, although I could be mistaken--IIRC there is info on this in another thread on this forum, let me know if you can't find it and I will try to dig it up.

It's great that you're looking for some adventure, but I would turn it down a couple of notches. You can go to Mongolia or Laos (or dozens of other countries) and rent a small bike there for a few days for some pretty cool trips, but even then you need to be extremely careful and recognize that your lack of experience means you really need to think about what you are doing at all times.

As shu says, if you really want to get in to the moto adventure thing, you really need to get some kind of bike at home and just get more comfortable on motos in general, and with travelling on them.

Best of luck, and let us know if you have further questions!