jjstrainz, I don't see where anyone answered your questions about GMAX tutorials. There may be a few on Youtube, however, by the time Youtube rolled out, GMAX was already deprecated, so while there are a few tutorials there, I would really recommend that you consider Blender for content creation in preference to GMAX. The cost out of pocket is the same, but there are online courses at the high school level (cf. <
http://www.cdschools.org/Page/455>), and at the college level (cf. <
http://gryllus.net/Blender/3D.html>), not to mention a wealth of tutorials available at Youtube, Vimeo, and through other sites.
I understand from past threads, that trying to migrate content from MSTS is not generally successful because of differences in implementtion between the two platforms, and that it is usually less work to create new meshes with Trainz in mind.
As far as purchasing a copy of Trainz that will provide you valid registration, Trainz 2009 is available as a digital download for about 10 Australian dollars (about 9.25 US dollars, but there may be a slight currency conversion charge). A digital download is just that: you download a file (or files) from the website, and install them on your machine. To do this, you would need a reasonably fast connection; if you are still on dial-up, you might want to do it at your local library, or school. When you have the files, you install them on your machine, following the instructions. If you get a different computer, or want to use the game on more than one, you can download the files multiple times, since you have the Serial number.
ns