It's always good to get into your starting position(such as taking over sewer area as alpha ASAP) if you can always get there first.
If there is a confusion-such as 4 players going to B and noone defends A-, you can call that round gg already in snd.

So I want you to claim your position before each round-1st round counts. Works more efficiently in snd, but it's always good to know who's in where.

2. Ghost your teammate when you are dead!

Ghosting comes in handy, especially in maps like sand-hog. You can basically see every enemy coming toward your base without being seen if you ghost some in ruins!

and please, just say things no more than twice. Once is good enough already. Tell new information if the enemy you saw changes position.

Tell your teammate if you are gonna ghost him so he can trust his back on you-this comes in handy.

Ask your dead teammate to ghost you.

3. Know your playing type.

---------------you can ignore examples--------------
I know that yuri and I are much more of supporter than rusher. It's best for us to stay behind, kill off all enemies who comes after our flag-holding member.
Or go in, snype-m4 works!- one or two, and then retreat-(quickly)repeat!- while rusher distracts enemies.
Bulla is more rounded than me, who fits in pretty much every position except snyping position.
Cody is close/middle-range rusher/supporter so he should be second person who goes for flag all the time.
---------------------examples ends here--------------------

Exceptions can be made, but knowing your playing type is the best way to kill more enemies. I've seen a game where 4 out of 5 members started cw with L96 in ctf-lame!.

4. Do not go in stacks.

You can't shoot the enemy while ur teammate infront of you, or u can shoot through him and kill both. Best way is not to stack at all. spread all over so enemy won't be able to shoot you and ur mates at same time! If 3 of you wanna go through double doors, give your teammate time to distract enemies! Also remember not to leave your teammates alone. Giving 1-2 seconds to first rusher would be enough to allure enemies.
If one of your teammate is covering the spot you wanted to stay, do not get in the way. I want you give at least 5 feet to your teamates if you have a chance to be a target at all. Get the hell out if you'r blocking snyper's view.

5. notify if you are doing something new. Nading counts.

Throw nade-> see your teammate going in at same time-> say 'zomg get the fk outta way massan'
is not gonna work against above-average clans. I might avoid your nade, but I'll be out of position, likely to get shot, and die.
Notifying nade will only work if every one of us notify each other. One or two members notifying will do almost nothing good.

If you are going into sewer or under vent, notify. From alpha B in War Head, I'll think that you are defending A if you stay under vent. Again, please notify your teammates.

6.Be quiet unless needed.

Clan war status shows everyone who we are. If you've played with me alot, you probably also realized that I get about 40~50% more kills if I don't talk at all and play. all of my clutches in cw was made by not talking at all.
Yet I talk alot in cw to communicate with ya all. It's obvious that we'll do better if we all do better than me rocking enemies.
Your death does not mean team's loss. So just help other by not talking. If you saw the enemy but live teammate didn't, notify him once and that will be good enough.

7. When I tell you to do something, it's not that you are doing something wrong. It's just that it'll be better if you do something what I say. Your ways will work perfectly fine if it goes as you planned, which does not always happen. If you are confident in what you are doing, ignore what I'm saying. I'm not a perfect observer anyway.

----------Here is a example where my advice shouldn't have ignored but worked out.--------
It was war head snd, we as alpha. We had 2 members and enemy had 1 member alive.
One of us were in B site with 3 hp, while other one were in courtyard with 73 hp.

I told one in courtyard to go to sewer->B and help one who had 3 hp, but he saw the enemy in A so he went in and killed him off.
If he lost on that fight, we probably lost also because other one had 3hp only.
------------------------------------------------------------------
It's fine if you can do what you think you can do.