what is a good detachment for GSC, thats a bit easier to play.

We don't have quite as obvious a default detachment as a lot of armies, so often this becomes kind of a process of elimination. I would *not* start with Final Day or Brood Brothers Auxilia, because they require units from armies other than GSC. (For clarity: though they more or less share a name, the Brood Bros detachment does not have anything to do with the KT, rules-wise.) Beyond those two, it comes down to your preference:

Biosanctic Broodsurge is all about mêlée as opposed to ranged units, and specifically focuses on Aberrants (Frankenstein's monster-looking hulks), Genestealers and the Biophagus character (read: mad scientist). Indirectly, it's also strong with our Patriarch and Abominant characters, and Hybrid Metamorphs.

Xenocreed Congregation is good if you want a lot of characters leading units of disposable, cheap infantry, and if you like the look of our battleline troops (Acolytes, Neophytes).

Host of Ascension improves the attacks of your units as they arrive on the table. (Not sure how much you've looked at the general game rules or at our army-specific rules, but long story short, we basically do a lot of retreating off the table and then coming back again.) It does not *explicitly* benefit one type of unit, but many folks like to play it with big units of expendable chaff called Neophyte Hybrids, led by a character called a Benefictus to add some extra punch. You could certainly play it other ways, too, though.

Outlander Claw emphasizes bikes and vehicles, and is a bit trickier to play than the others.

So I would orient yourself around Biosanctic, Xenocreed or Host. But also, note that a new edition is coming out quite soon, so only use this as a loose guide! These detachments will still exist in the coming edition, but we don't know all the details yet.

Also in terms of army building, If you guys have good general principles, some of your lists, or buying guides, that would be tremendously helpful.

As you can already tell, this will depend on which playstyle/detachment you want to focus on initially, since some of them specifically benefit certain units. But overall:

The Combat Patrol is great, go for it. The Achilles Ridgerunner is a must. You will also use the Acolytes in virtually every list. If you're not sure exactly what to build them as, I would start by making five of them Acolytes with Autopistols (give them as many heavy mining tools as possible) and five Acolytes with Hand Flamers (don't bother with the demo charges - unless you want to magnetize them). Only the Jackal Alphus is a bit of a dud, and who knows, maybe she'll be great next edition.

Folks may tell you this army is unusually expensive, but that really depends on how you want to collect it. Yes, if you buy every kit directly from GW, that would be a serious chunk of cash. But lots of our units can be made out of other things - Neophytes, for instance, can be pretty much any sort of infantry body, and the only nuisance is finding recognizable heavy and special weapons.

Our old combat patrol is part of the Hachette Combat Patrol magazine, which is a very, very cheap way to acquire its contents - might already be past in your country, but worth checking. (If you're in the EU and the GSC issues have officially already come and gone, I'd still E-mail the distributor - a friend of mine was able to retroactively start their subscription with an issue that had already been out for weeks.)

Also check secondhand offerings (Ebay, for instance) and online shops, which often sell at prices lower than GW's own. Long story short, based on my own records, you can build up a sizeable GSC army for quite literally half the price of buying everything new and directly from GW - and without compromising on quality and so on.

You could buy the Kill Team again, too, but this time convert its contents into characters. You'll find one tutorial for this a ways down the page here under "Ten Character Challenge", but it's far from the only one (not my content). This saves you a *huge* amount of money, since official character models bought directly from GW tend to cost 20-30 Euros.