Ok so I made this topic because I am an experienced noob myself, as I totally sucked in this game a few days ago and couldn't find a guide for basic survival/teamwork stuff. Of course I read hours about tactics, tips and tricks from the forum, but no way I could remember all that when I went to multiplayer. So here I'm gonna put a few very basic tactics and tips that would have saved me from a lots of "f***ing noob" insults. I would have been saved from all that if someone would have told me these tips I'm going to share here, but I learned it all in the hard way.
Let's keep these short, so some beginners might actually remember a thing or two when heading for their first "real battles"
Right, so finally to the tips.
Of course, play the single player campaign first before going to the multiplayer. Or at least the axis half of it because it will teach you the very basic things about moving, shooting, squad leading etc.
IMO the new players should start in "relaxed realism" servers, even the "realism freaks" because of the HUD is easier, teammates names are on their heads and teammates are visible in the map. After learning the teamplaying basics you should move to realism servers.
When first going to play multiplayer, I suggest you start as a basic rifleman. The rifle is a very good weapon for mid/long range. After some practice you'll start dropping people with it but avoid attacking in houses alone with only the rifle.
And as there's many rifle slots in a team, you save the other weapons for more experienced players, in whose hands they are the most effective. Nothing stops you from picking a gun from the ground though.
If you find you asking yourself repeatedly: "What the hell am I supposed to do?" Then here is the answer.
When you spawn, you should look at the map, (M) and check what's the situation in the game, and importantly where the fighting is happening and if you are defending or attacking. If you headlessly rush in to the battle without knowing anything about what's going on, you just probably end up dying, causing more harm to your own team than the enemy.
There usually is a "front line" somewhere usually at a capture point. That is where you should be heading. Don't advance too far, and try to be with teammates, preferably your own squad.
The best thing a beginner can usually do, if nothing else, defend a cap zone. Simply look at the map where you should be defending, or press T and head there, look for a good defensive position and shoot attacking enemies. You'll do a much greater service to your team that way than going rambo and keep dying every 30 seconds. And you get points.
Don't stay camping in one place for too long. If your commander is throwing artillery at enemy position, it usually means an attack is about to start soon. Look if your teammates are attacking after the arty, stick with them. Don't go in first because that's the smg guys job. As a rifleman you should try to keep a bit distance to the enemy. If you are succesful and stay alive and manage to capture the point, you'll get a lot of score.
DON'T GO ALONE! If you end up in a situation where you cannot see any of your teammates and not sure where you are or are supposed to be, don't start running around like lost child looking for his parents, instead try to find a relatively safe or hidden position, look at the map for a quick overview. You can press T for the tactical view, and that should be used a lot. If you find yourself being in a very bad place, try to get yourself in a better position, usually back to your teammates.
Here are some quick basic tips I could remember now. I know there are a lot more experienced players, from who I wish feedback and corrections to these tips. If you have some good tips for the beginners how to play as a team, please let us know. I'll add some more tips to the OP when I remember, and other peoples good tips if they're willing to share.
From a new player's point of view, these are some core things you should know when you start playing, and the game itself doesn't directly teach you very much.
Share us your tips and let's try to make a good "newbie guide" so we don't have to get saddened by new players who have no idea what they're doing, and that they could also make themselves the most useful to the team.