Hi @WilliamBoersma31, and welcome!
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For help with coding a jump mechanic, you can check out the following topic - How can I make my character jump?
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For coding a gun, do you have your models ready, and you need help with coding the shooting bit of it? Do elaborate a bit more on what you have done, and what you need said gun to do.
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For explosions, you can check out https://playcanvas.com/project/439297/overview/explosion-particle-effect, and check the
play method
for particle systems - https://developer.playcanvas.com/en/api/pc.ParticleSystemComponent.html#play.
Hope this helps!