i need a some help with coding and animating the covenent and vehicles

i am a young game developer, starting out my journey and i need help with my game: here's the link - i started making it a whole week ago./watch?v=rrUFjAXM9zI&feature=youtu.be i can't post a full URL so it's on youtube. also, NO-ONE has donated to my indiegogo campaign!
in my game so far:
cubes
terrain
grunts
warthog
elites
first person (player)
EDIT: i can't add the enter/exit script for some reason... or health or reycast (i'm a sh1t programmer but setting the gravity gun to 1, 000 is fun

send me a pm in my inbox, able to do it for you mate.