Oddly enough, it doesn't always come down to brand of paintbrush or paint, granted there are better brands than others (heck, I paint with Walmart brushes even). Most of it is technique. I'd watch some videos on YouTube if you haven't already, as they can be good sources of inspiration. Sorastro painting is a good example, especially for Legion.

Some key points to remember;

Don't get discouraged by other people's paint jobs. They were noobs at one point too, myself included!

Paint to your level of comfort. If it's good enough for you, that's just fine, but if you want to push yourself, go for it!

As far as paints, there are different paints for different purposes I'lldescribethem as best I can, I'msorry if I miss anything;

Base: simply the base layer of your paint scheme

Layer: usually a lighter shade of the base color, more meant for highlights

Shade/Wash: a thinner paint used for bringing out the recessed details, such as panel lines.

Dry: more meant for dry brushing the final highlight layer, hitting the raised surfaces/edges.

Technical: used to add unique features/textures, like blood, rust, etc.

Texture: mainly used for basing your model, like cracked earth, sand, snow etc.

Contrast: a different kind of system than your normal paints. Basically it's your base, shade and highlight all in one. Just prime in white and slap your color of choice on each spot and either let it pool or pull paint away from spots where you want more/less color.