Hello, i’m creating a cool infection map. When its complete, i would like to show it to 343, with hopes that they at least take a look at it. Is there any process i can take to do this?
Like a submission form or tweeting them???
Most of the time youtubers are looking for maps to try out, find out which and see if you can submit there. It won’t be an instant thing but if the maps good it will get noticed by fans, then 343 might take some interest, but otherwise just have fun making the map 
OP check out the Community Creations Forum.
Try Forgehub, lots of youtubers also check there.
You have to submit your map to forge hub and forge labs. If the map is popular enough they might showcase it on YouTube and as it’s popularity grows 343 might look at it.
All of the above - YouTube and ForgeHub. If it’s a good enough map, put it on Reddit too and see if you can get some traction with it