What's a good build for a first time gun lancer

How convenient that you just hunted your first Pink Rath, considering you should work towards making the Royal Burst gunlance

Level5 guard is always your friend when you're new to Lance. U basically can block everything at your level.

I run a mix of :

Rathalos a ( torso,legs) for weakness exploit 3.

Lavasioth b ( head,waist) for quick sheath 3.

Artillery charm lvl 2 ( can't upgrade yet).

And lumu a (arms) for the last artillery skill point.

I suggest gobbler and free meal in the gem slots if you have them( or really anything you like it's just that I don't have any interesting gems).

And of course using the pink rath GL.

Additionally I suggest you paint the armor pink and you'll look just dashing :) .