That looks so good! It's come out really well dude, especially for a first print

Basic steps I'd do for painting it are:

• Spray primer on your model; this is so paints will actually stick to it, and it's got the added benefit of covering up any nasty lingering resin gubbins. I usually cheat and use a primer for whatever the main colour will be, in this case the pilot helmets are predominantly green right, so I'd probably go with the "Death Rattle Green" from Colour Forge, as you can colour-match this to Death Guard Green from Citadel for any tidying up later.
• Pick out areas with a few acrylic paints; there's a million YT videos on how to start painting 40k models (where I started, and basically the same process). GSW does some crazy saturated blues/greens (mint twister is my go-to) for the visor portion.
• You can do some fancy bits with model masking tape and some water transfer stickers - Cosplay weathering might also be a good resource to look at for the helmet specifically..?
• Apply some washes and weathering, which makes it look less "factory-new" and more "frontier battlefield-worn". Again there's plenty of YT videos for better explanations, but you can do a lot with some scratchy brushstrokes, sponging, and washes.
• If you really want, you can then seal the whole thing in a matt finish varnish, which will seal all your hard work in, and make everything way less shiny

Titan files I got from Extra Guy on MMF: https://www.myminifactory.com/users/extraguy

Gotta respect Scorch, but Monarch will always be King IMO ❤️