Im new and have some questions

So im new to the game and yes im one of the guys that got it from Epic Games
So how do you place objects? Like with a hammer and all that
Are shotguns like the trench gun effective at ranges greater than smth like 10 meters? (32,8ft) because in many other games the shotguns dont even kill anymore on like 5-15 meters doesnt matter how long the barrel is
How do you aim with artillery? I mostly just put a marker on my map, adjust height and rotation and boom, Is that a good strategy?
Is there a way to make the proximity chat louder? I got it on 100% everywhere but i still cant hear my mates even if theyre right next to me
oh and how does that work with the supplies? for example in the map it says we have over 50 supplies but we cant build those objects with the hammer where it says it needs 50

Thanks in advance, i love this community and the game