i will be doing no limits (new to it) as well as RCT3.
So if any thing that could help me please tell!

LEARN NEWTON!!!

(it helps alot!!)

What is newton?
Is there any way for me to get it?

Newton is a force based rollercoaster editor. Its kinda hard to learn but when you do, you can create perfect rides!
Download at
http://coasterchamber.com/

Watch Entropys newton tutorials at:
http://www.youtube.com/user/TheRealEntropy