1) Find good FOB locations, and coordinating this with other squads
you dont need to coordinate this with other squads, there are plenty viable fob spots and never enough fobs.
2) Place down radio, hab, and other emplacements
99% of the time you dont place other emplacements as an inf SL
5) Give range markers for LATs and mortars ASAP
LATs, sure, mortars should be in a dedicated squad.
6) Pass around FTL
Give it to LATs or whoever seems to have the most brain and tell everyone else to STFU.
9) logi into hab runs
others can do it just fine and you dont need them unless dealing with vehicles anyway. Most maps have enough logis for 6-12 FOBs. If you're new you'll die often enough to just reset from main when you actually out of supplies.
4) Find objectives for your teams.
7) Be the only comm liaison between your squad and other SLs
10) Lead the team
just no on these points. you pick the closest valuable asset (camping vehicle > FOB > cap) you can deal with and shit out a rally next to it and attack it. If that isnt enough of a hint for your quad mates you can repeat it.