I downloaded GMax, but I need help with the how to's. EXAMPLE: How to draw a box.
GMax is no longer supported and most new builders start with Blender. However, there are many modellers here that use GMax for many reasons.
Whichever tool you decide to use you should spend a couple of weeks just playing with it and learning the interface. There are books available and tutorials on the web that will help. Don't even bother trying to do anything for Trainz until you understand the interface.
When you do want to move on to Trainz stuff start with boxes and other shapes as Trainz scenery objects. I cannot speak for GMax although I have it installed but for Blender there is:
http://online.ts2009.com/mediaWiki/index.php5/HowTo/Export_from_Blender which I wrote.
and some really good stuff at:
http://en.wikibooks.org/wiki/Trainz/Tutorial_for_Blender#Newcomers_start_here some of the pictures at that link are for an older version of Blender but the principles are the same. I started with this site.
As a convention of sorts, the posters in the Trainz forums do not like giving advice on simple issues such as "how do I draw a box?". We would expect you to use the Internet to find examples of that. You will not find them here. But we will help on aspects of getting first assets into Trainz and questions on detail. You should, however, do the tutorials first.
Practically every question you could think of in your early days as a content creator has already been asked in the Content Creation Forum
http://forums.auran.com/trainz/forumdisplay.php?12-Content-Creation-Support.
The search engine in the forums is not the best but will work. The other link worth noting is the Content Creator's Guide (CCG) at
http://online.ts2009.com/mediaWiki/index.php5/Content_Creator's_Guide. N3V originally wrote the guide but want us to us their TrainzDev WiKi instead
http://online.ts2009.com/mediaWiki/index.php5/Content_Creation. However, the layout of the CCG is more similar to a book and consequently a lot of creators still like it. Unfortunately the CCG is rapidly getting out of date and some information there can be wrong. You need to keep that in mind.
Please don't try and make a locomotive first. I did, and I can tell you that learning a 3D modelling while learning how to make a loco for Trainz is extremely difficult.
When you do want to make a loco then have a look at Paul Hobbs' website at
http://www.44090digitalmodels.co.uk/index.html. I used Paul's Blender tutorial to help me build my first steam loco but the tutorial is for Blender 2.49 and that version is visually different from the current versions (2.67). Paul has said he will rewrite the tutorial for later versions but writing such tutorials takes a long time so I would not expect to see it anytime soon.