As in what to load? Before you buy anything you have to figure out the purpose and desired result. Hunting load? What are you hunting? Distance you normally take your game? That will point you in the direction of what to buy. Target shooting as far as you can...that's a different direction.
Some quick thoughts or suggestions :
Hunting - Popular with the 6mm Creedmoor is the 103 ELDx from Hornady and the Berger 105s. Both will use similar powder charges ( similar not same...if your lucky then maybe the same) Powders I would lean toward are usually temp stable variety ( since load development and hunting conditions rarely match) That said RL16, H4350 and IMR 4451 stand out as very stable powders. H4350 is easiest to work with but word on the street is it is hardest on barrel life. RL16 has been my go to since I was turned on to it. This stuff is just great. Fairly easy to work with and rock steady. IMR 4451 gives respectable speeds and accuracy. Have not put the extreme ranges of temp stability to the test but it is good stuff and easier to find usually. All will provide more then adequate hunting velocities up to 350 yards ( debated begin about ethical distance after that usually and I stay clear of them)
Target and LR - 108 ELDM, 105 BTHP from Hornady are solid options the latter for practice the former for maxing the legs. Sierras 110 MKs are about the upper end of your barrels twist capacity ( I would stick to 108s and lower ) Powders here can vary depending on where and when you shoot and maybe your not as worried about temp stability. But the usual suspects include H4350, IMR4350, RL 16, 17, Superformance, 4381SC ...really there are plenty of great powders out there. Heck there are folks having a blast with RL 26 and H100V etc. Really just tons of data out there.
Brass you have lots to choose from and the top contenders are the usual suspects...Lapua, Peterson, Startline, Hornady, Nosler, Norma.....
Always start your journey with the normal manuals and manufacturers web sites. These will get you in the ball park and on a safe path. You sound like its your second go around with the 6mm Creedmoor? If so you have all the above probably in your memory banks already....but that's just my thoughts or suggestions.