You' ve probably bought your kit now, but just in case you haven't, or for anyone else...
I’d recommend 2 to 4 short QuickDraw sling lengths, for clipping the first couple of bolts / trad gear, this marginally shortens the fall if you do ping off low down, and maybe the other two could be srategically used elsewhere enroute, but make the rest 18cm or 25 cm, as it's usually going to make clipping the rope on a panic clip a tad easier.
Re thick or thin ... I don't like thin on sport, as I'm often mindful about which way I wanted the rope clip biner gate side facing, usually away from the fall direction, but, except with 10 and 12cm lengths, longer (18 + 25cm) thin trad type slings would often twist in the direction you don't want them to face!
Whilst this point is important on trad too, which way the rope clipped biner faces, it's more important that you don't risk lifting your gear, so medium and longer thin supple slings are then best for trad, 18's or all 25's, and a couple or a few slingdraws made out of 60 cm slings.
Re biners, wiregates are more acceptable for trad because of weight savings, but there is /was an argument that they are good for sport too, as wiregate's gates are much less prone to gate flutter at the rope clip biner and possibility of rope unclipping then.. but looking at the biners most pro's use, it's probably not a concern?
If you intend to do sport mainly with a trad type of mindset where you will climb a bit below your limit intent on onsighting everything, then the marginal weight savings of wiregates might also be of interest. But with sport, within a year or so of getting confident about falling on bolts, which most now start to gain through indoor walls, you might want to add a few heavier duty sport draws, or just heavier duty carabiniers that you can interchange the wiregates with before you leave home, that you can perhaps put on the crux(es) of your redpoint project.
There's usually only a couple of places you might more regularly fall, the crux(es) until you figure it out, and some random place after because you are pumped.
I used to swap and change my wire gates between trade + sport slings, but it's tedious if you go out a lot, so I bought wire gates for everything.
Now I'm beginning to add some heavier duty straight gate keylock biners to the bolt clip ends of my sport draws.
Falling on bolts will start to eat into your carabiniers, so with wiregates, it's good to be able to distinguish which end you will always bolt clip, by having different colours, eg, always use silvers for bolts, and a colour for the rope. Sport draws make this clear with a straight gate for the bolt and bent for the rope.
Wiregate biners may be less durable with regards to bolt chew, than sturdier solid gates.
Solid gates often have higher strengths too, which may be a comfort for some if you're a heavier person?
Most bent gate biners are a decent size + really easy to get the rope in, sometimes a wire gate can feel like it's harder to clip.
I haven't tried any bent wire gates, but they are available.
I have dmm spectres, chimera, alpha light., but WC wild wires look the same, and WC helium compare well with dmm chimera + phantom if u want super light in a normal ( more manageable?) size.
Sport biners I'd buy ... Dmm shadow ..light + strong.
Wild Country Proton + Electron very strong too.
If buying biners and slings separately for whatever reason, bear in mind that smaller biners have smaller baskets and are designed for trade sling pieces, ... Sport slings will not sit in them properly, they will end up sitting at a silly upwards tilted angle.
Spectre 2 size / shape biners will take sport slings OK, but chimera, alpha light / trad , phantoms + some others won't.
Likewise WC wild wire biners probably will take sport slings, but maybe astro + helium biners won't?
Quickdraw Slings with external rubber / placky keepers for the rope clip biner, are a better idea than with internal rubber, as this will soon tear out.
Edelrid bullet proof might be a great idea for the bolt ends on 3 or 4 super doggy draws, perhaps a couple more if you use quickdraws to manage rethreading the lower offs, maybe these ones matched with bulletproof rope clip biners if you want a pair of dedicated lower off + then top rope quickdraws.