First you get your Queen
Then Xbow 1 and 2 (two builders)
Then laboratory (one builder)
Then spell factory (one builder)
Then the other new stuff. Army camp if you really really want them. CC is good but need more gold.
Explaination:
Queen : no contest. Instant build and she will even help you farm
xbow : they are up in war map right from the start. Contrary to any building you upgrade which will take many days before making a difference in clan wars
laboratory : If you want those level 6 troops, you need this as fast as you can. You won't spend much elixir at start (4.1M) so you will need a place to dump your elixir. If you do army camp, you might not get enough elixir for 6M upgrades. Your choice.
spell factory : You will be weak in clan war for a while without spells. But the 4th spell is needed to 3 stars tough bases. The jump spell is not that useful. You need to upgrade it at least once so it can stay longer. But 4 spells is a must.
Other new stuff : The more building you create, the less chance you have to getting 3 stared. So any new def or buildings should be created. It will get you time to gather gold to upgrade your CC.
Army camps : For me, I didn't need the extra 20 troops while farming. So army camps were too expensive to do right away. I prefer upgrading my CC because the extra 5 places gave me room to receive a golem in my CC. After some 6M troops upgrades are launched, you will have time to upgrade your army camps. But before the first upgrade (giants in your case), you should stick to smaller upgrades or new buildings.
Barracks : Witches are a must for ground attacks to get 3 stars. If you have too much elixir, this is a great investment. Level 2 cost much DE. But it's worth it.
Good luck
