Hi there Kenny....
...and welcome aboard the HUBB!! It is always good to have new members and many of the folks here will be able to help you with advice, hints and so on.
Concerning your questions: I see you are still pretty young. So, if it was me, I'd buy a good used bike first. Which one - there are lots of them out there and it all depends on you. Of course it is also a money question. As for me, I am riding a VERY old Honda TransAlp, the Japanese model with 400ccm, built in 1992, with now roughly 50.000km on the clock. I am more than satisfied with the TA, it took me on a 3.500 kilometer touring last year to Hokkaido. Good gas/milage, easy on maintenance (if there is any), and fast enough (at least for Japan, where you have a max. speed limit of 100km/h anyway).
Using a tent - yes, that's what I do. You will always find a place to set it up for the night. Go for good quality (there are lots of posts here on the HUBB), cheap stuff will not take you anywhere in the longrun!
If there is anyhting I can help you with, get with me (also by mail: klausdorth(at)web.de. Always ready and willing to help fellow bikers.
Klaus D. Orth
A German in Japan
1992 Honda TA