First, install the muzzle brake correctly. It's rotated 90 degrees from where it's supposed to be. The ports should be pointed out to the sides.
Next, if this is your first target gun I'd say just buy some good match ammo, a good rear bag, quality cleaning supplies, and shoot it. As you shoot it, you'll learn what you need. You'll probably want to upgrade that bipod fairly quickly (Harris or Atlas would be my suggestion) with something that is a little more solid. The trigger pull weight is adjustable on Tikkas, and you can get it to go even lighter by swapping the trigger spring with one from MCARBO, Yo Dave, or Mountain Tactical. Additionally, if you don't already have one I'd recommend getting a torque wrench that measures in inch-pounds so that you can be sure that everything is torqued to spec.