[Shogun]

the most important thing to you have to do to get lots of xp:

join a squad and keep it full! the more people in a squad, the more xp you gain for basecaptures and for everything that is killed. you don´t only get your own kills xp, but you also get xp for what other squadmates kill!

also keep the squad together! if all the squadmembers are near each other on the map, the xp bonus is bigger. a maximum of 1 or 2 members are allowed to stay away to not punish them for antruns or other resupplying, but as a general rule, stay together. and of course stay on the same continent. you don´t get squad xp from anything that happens on another cont.

and don´t lead a squad if you are after xp! the squadleader will earn CP instead of XP for captures. so if you don´t want commandpoints, promote someone to leader who wants them shortly before a hack goes through.
go for xp first. cp is mostly useless at first. and earning enough cp to get orbital strike ability takes months or even years.

very good xp sources are:
a deployed ams near a big battle
a loadstar landed near a vehicle battle
repairduty beside a repairterminal in a courtyard
setting up a router in the base next to a battle where everybody respawns to get vehicles. you need to deploy the router vehicle near the vehicle terminal and lay a telepad near the spawnroom, but NOT inside the spawnroom because enemies can use it as well, and you want at least one door between the pad and the spawntubes. also lay mines directly under the routervehicle and setup spitfires around it. you will get xp for every kill someone makes after he has used your teleporter.

also, if you are cought in a tower battle, go up the stairs and crouch behind the first line of ai-maxes to repair them while they eradicate the intruding forces.

that are all perfect support xp sources that don´t involve killing anything on your own. don´t panik if you try anything of this and you don´t seem to get any xp from it. the support sp doesn´t update in realtime. you get a bunch of all collected support xp together every few minutes.