Mark welcome, have a look at this site below. You don't need to buy the software as you can get various telescope/eyepiece/object comparisons at the site to at least give some some idea of how scopes, eyepieces, barlows, focal length etc work together.
Collimation is something you will need to come to grips with along with learning about sky conditions and "seeing" particularly when viewing planets. Don't panic about these things though as you will soon come to understand them.
You will get a lot of ongoing great help here on IIS and maybe worth a look up of your local astro club.
It just gets better and better as you learn more about this wonderful hobby, it can take you places you never imagined.
http://www.telescope-simulator.com/