Clone Wars era does not require Jango style only. The modern CRLs are allowed for that. So you can look like Boba, like Jango, etc. As long as you follow the CRLs, you're golden.
Testing color schemes can work in MandoMaker. What I would first do is read this entire post:
http://mandalorianmercs.org/forum/index.php?topic=153454.0 It is amazing and really helped me understand the process better, and has a ton of great links. Then use MandoMaker and test out various colors. Also, you can always do it old school- print out the mandomaker all in white, color it in with pencils to try out various patterns and stuff. That's more useful IMO for understanding patterns vs colors overall.
For real life color testing, what I do is take scraps of sintra and paint them to see how it looks. You can check out my Armor WIP to see what I did this weekend to tr y some stuff. It really solidified for me how to approach my new color scheme and also reinforced the technique I needed to use. Plus, it is a lot of fun!