Depends if you want the fun way or the easy way.
The fun way is to train up to BR3 then grab med ass and heavy assault from the off. Then go kill stuff.... with or without squad/outfit - despite what you will read (usually from those desperate to accumulate points for CR3
) PS is quite playable solo, indeed as a heavy grunt you will score more alone IMHO
as long as you are in the right place at the right time . When you have gained a few BR, you can begin to develop your character into what you really want.
The easy way is to train in whatever you like as long as it has wheels then be
in the right place at the right time . In effect, that means "follow the Zerg".. or, to be accurate stay one step ahead of it. In other words, you want to be at the enemy base your onrushing Vanu hordes (although faction makes no difference to any of this) will be capturing next. Stay there until the hack, grab thousands of XP for doing naff all and move on. Never defend anything.. the XP system is so nerfed it's pretty much pointless..... I should point out this is
not fun but if you really want to gain XP in a hurry, it's how a lot of players have. Especially those who whine about newbs a lot