help on software

Hi
Just joined the group, but been working on my CNC project for a few
months. I've purchased several plans to build a CNC milling machine
for wood working.
I have a Xylotex 3-Axis Board running 3 steppers just fine.
Since I'm new at this I have downloaded several CAM, NC, and
simulator programs but am having a hard time running them. The
documentation is not complete and few have a tutorial.
I am only using this as a hobby and am somewhat limited on cash.
Which programs (CAM, NC, Simulator, etc) would you recommend and is
there a good way to learn how to use them ( I'm new at this) ?
Any and all help is appreciated.
thanks Bob