I have the set you linked. It's good. However, if you're just getting started, I would recommend https://www.amazon.com/Army-Painter-Miniatures-Highlighting-Miniature/dp/B01MTXRU2L/ref=sr_1_4?dchild=1&keywords=army+painter&qid=1595623640&sr=8-4 and put a few bucks towards some brushes.

You can actually get away with a lot more than you think with only those 10 colors. Then, if after painting a while you still think it's something you want to keep doing, go for the big set.

I got this AP set and it has everything you need to paint to canon colors. You can always mix paints as well. You'd probably need a wash specific to your theme (the one included is a muddy brown wash) as well as a primer and finish.
https://www.amazon.com/Miniatures-Highlighting-Miniature-Army-Painter/dp/B01MTXRU2L/ref=sr_1_5?s=toys-and-games&ie=UTF8&qid=1529208042&sr=1-5&keywords=the+army+painter&dpID=51ansRxCaNL&preST=_SY300_QL70_&dpSrc=srch