The biggest thing you need is good glass with a reticle that you can use for holding wind, and elevation if you prefer to hold rather than dial. I would recommend a 16X zoom at a minimum. You'll probably end up spending more on the scope than the rifle.
Next is an accurate rifle. How accurate depends on how much you want to spend, but the Tikka has a good reputation for a factory gun. The Bravo or any other chassis isn't necessary to get started, it is just more comfortable to shoot.
Ammo is also going to depend on what your budget and accuracy needs are. You can have fun shooting steel at 100 yards with bulk pack and I have had pretty good success on clay pigeons at 200 yards with Automatch. CCI Standard Velocity is a little better. After that it's 10 cents a round and goes up. The good part is the panic buying doesn’t affect the premium ammo nearly as much as the bulk stuff.