Heres my honest opinion if you really want to use DarkRP:
Use a base besides madcows (It has cross-hairs, I suggest the CSS Realistic Weapons pack V4). Make every single weapon cost a ton, have the running speed set low (450 perhaps, maybe 375) Set walk speed to 200 or so. Edit every single weapons lua file so it has tons of recoil and is not accurate for shit (Besides snipers) Have only one job spawn with a weapon (Police) and just give them something that reduces someones walk speed or just stun them so they can’t move.
Heres what I would suggest if you consider another gamemode:
Use Tiramisu, modify it to your needs. (The group works something like this, you designate someone the leader of said group, said person(s) can recruit other people into their group and etc, give someone you trust lead of whatever factions, regulate gun flow, make updates every so often.)