What do you actually play for in game? You mention campaigns, how do they work?
Basically there are two sides, allied and axis. Allied is atm made up of British and French (who get a lot of american equipment later on). There are plans to introduce the Italians, americans, russians etc. Who knows when that will be though.
Right now the campaign map stretches across southeast britain, northern france, benelux countries and west germany. It's all free roaming so if you take a bomber in britain you can fly to dusseldorf and bomb their factories if you want. Let's just say it's huge and you'll never feel like you're in a constricted space
The campaign basically pits the two sides against eachother on a middle starting line, axis are generally given a slight advantage by owning most of the forward bases along the line at the start. Forward bases are basically spawn points for infantry and vehicles close to the oppositions town, there are two between each town, one for each side. If you take down your enemies your one becomes active letting you attack their town.
Anyway the campaign starts with early equipment, Matilda tanks, hurricanes, 110s. As it progresses roughly every 7-10 days a new tier is reached that gives better equipment. Each sides progress through the tiers can be affected by damaging their factories by bombing or sapping raids. Campaigns lately have been around 30-40 days long so you'll reach tier3 which is the last one, this gives you the best shermans and Tiger tanks as well as Spit9s and 109G and 190s.
The campaign ends when either side controls roughly 90% of the maps towns. There are roughly 200 towns on the map and each one is a big fight to take. The amount of Attack Orders (AOs) your side has depends on the current server population. Generally you have between 3 and 5 AOs. These can be placed on a town, once an AO has been placed for 10 minutes you can start capping the flags in the town. These flags are depots that are linked to each of the surrounding towns (usually 4 or 5). Once you have capped a depot the town is contested, if you keep the town contested for 10 minutes the Army Base(AB) of the town can be capped. The AB is the towns main flag, once you get that the enemy brigade(s) in the town are routed to the next town. After that you just have to cap any remaining depots and the town is yours and you can move your own brigades in.
The AO placement and brigade movements are all controlled by members of the High Command(HC) of each side. There are about 40 or so HC members on each side so there'll always be 3 or 4 on even in the low pop times one of whom will be map OIC and he generally dictates the course to take such as concentrate on pushing this area here or attritioning an enemy division here in advance of a big attack later on.
Each side has about 30 brigades split up 3 to a division so about 10 divisions a side. Each division can move anywhere on the map and each brigade can move to any town so long as it's next to another brigade in its division. Sometimes towns will be left defenceless without a brigade in them. The only way to defend these would be if you have a brigade in a linked town you can spawn into the empty towns linked depot or you can paradrop in to defend.
It's pretty hard to explain all the details without showing them in game. Basically at the start you'll be looking for the big battles. These are easy enough to find, you can ask on the chat or just listen out for calls from the HC members or people at the towns requesting help. All you do then is right click on the town and join one of the brigades defending it or if it's an attack you right click on the town the attacking brigade is in and join it then join any of the missions that are up within the brigade.
I think I've rambled on a bit much on it. If you have any other questions just let me know. This game is the best online game I've ever come across, all it needs is a larger playerbase to be phenomenal.