I am working on exactly this as well right now. This thread has helped a lot as I’m new to everything! So thank you everyone!
I wanted to post as I have some working (but messy) blueprints set up to do the following:
Pick up weapon and ammo
Equip weapon when picked up
Fire projectile and reduce ammo
Never pick up more than max ammo
Use mouse scroll to switch weapons
Display ammo and weapon type on hud
If anyone wants to see specific code I can post it up for you.