Ok asking for advice

[Seraphor]

FC 'statics' are rarely a good idea. Things get heated, feelings get hurt, people fall out. A static is a pragmatic thing, based on progression and prioritising what's needed for the good of the group. This is not a good thing for established FC's. It's not just things like "player x needs to do more DPS and die less", but things like "Player y can't have loot this week, because player z needs it more" and "Player w progged without us?! that's so inconsiderate!"
Your better bet would be to take your FC into savage on a casual basis. Pulling in PUGs to fill those last two slots. If and when it comes to current savage prog, everyone should be able to join an external static on their own merits, and if you can manage to do that together then that's great.

[Jeeqbit]

FC 'statics' are rarely a good idea. Things get heated, feelings get hurt, people fall out.

Often true of statics generally. Especially if your goals don't align and need to part ways, or progression speeds are significantly different. In this case it would require both sides to be able to do all this respectfully and with great patience, and some people have that, but others don't.

Setup Clear Expectations from the get-go
The purpose of the Static is x and your Goal is x.

This is very important as well. If some of your static want to prog "for fun" and "the social interaction" and not necessarily to clear, and others want "the loot", and others want to do speedkills, and others want to do it blind, and others want to do it with a guide, and others want to do it within a certain timeframe (beating them all within a certain amount of weeks), then the goals might not align and that doesn't go well.

I came from WoW and 90% of your raid teams are in guild

Our "guilds" are restricted to a single world and restricting raider recruitment to a single world is unnecessary. Cross-world linkshells and discord servers have taken over in that area, leaving FCs for casual or social content a lot of the time. Raid teams here are not that large, except for BA and DRS, and we have cross-world discords for that too.

Also starting in ex might be great since none of us have raided savage so might get us used to mechanics

Extreme is easier to get into and to clear. They can be really hard for newer players but they are more recoverable and there are guides for these as well. It's worth following guides at least at the moment while you're all new. If you can clear an extreme you can most likely clear the first two raid floors of a tier which are usually relatively easy as well. The final two are what normally wall people.

There's a practice dummy with a DPS check??

You should be able to beat it in the latest pentamelded crafted gear (or come close). You can use high quality food and HQ Grade 7 Tinctures (they will probably be Grade 8 in 2 weeks). Tinctures boost the main stat for 30 seconds, so you use them together during burst windows when all attack buffs are ready. Strength is for tanks and melee DPS (except Ninja), Intelligence magic DPS, Mind healers and Dexterity ranged physical (Bard, Machinist and Dancer) and Ninjas.

to some people raiding is just a transaction, they put in time they expect gear in the end and that's all they care about.

It doesn't have to be completely a transaction. You can be friends and do other content and that is even healthy. Where the transaction comes in is that you are all respecting eachother's time, putting in the appropriate and agreed effort and if you need to stop raiding together because of goals not aligning, you each take a deep breath and not be hurt by it and just understand that each side is doing what they need to do, to achieve their goals.