Hello Shyguy! Welcome to WWS and to the wonderful world of NoLimits!
To answer your questions...
1. This will take some time and a lot of practice. It is still hard for me and I have been at this game for about 5 or 6 months. I used this page:
http://www.coasterforce.com/No_Limits_Tutorials to help me learn some things about NoLimits. It should tell you some things you should now about when using NL. Like I said it is not easy to do. It takes a lot of practice. You can browse the different tools that are used in the game here:
http://www.nolimitsdevcenter.net/toolbox. That website allows you to post information and pictures about any coaster that you are designing. A lot of members here use this website.
2. There are these things called 3ds that can be used with a coaster. Like all other things with this game, you have to make the 3ds yourself. You can do this by using multiple programs. If you would like to know more about 3ds, just send me a Private Message.
If you have any other questions about the game or need help with anything, just go ahead and PM me and I will be glad to help you!