Hi there Zenyth and welcome to SimV. OK, CFS2 add ons, where to start? Well, if you have not added any add on's before, read the tutorial. You will find it here
http://www.simviation.com/acinstall.htm You will find this useful.
What planes to add? Well, you will find just about any type of WW2 and many modern types that you can add. Some are better than others and it really is a personal choice. If you add a plane you do not like, you can just simply remove it! Remember though, CFS2 only allows a maximum of about 100 planes to be installed. Sounds a lot, but I've now exceded that total in two installs of CFS2!
Hope I've been some help there, sorry if I've gone on a bit! Happy Flying
