Your rifling twist is 1 in 14. Because the typical 22-250 chamber has a lot of freebore, handloads will far outperform factory ammo. In handloads and factory ammo, your rifle will likely shoot its best with 50 to 52 grain bullets. When I had a 14 twist barrel on my 22-250, I was never able to get it to shoot well with anything heavier. Unfortunately, that included the better 55 grain bullets and factory loads available.
If you want to start with factory ammo, I recommend going with the Winchester white box 45 gr JHP, in the 40 round value pack:
https://www.midwayusa.com/product/2...-250-remington-45-grain-jacketed-hollow-point
Or, go with the PRVI 55 grain soft point:
https://www.midwayusa.com/product/1...2-250-remington-55-grain-soft-point-box-of-20
Either one of these will serve as a good baseline to give you an idea of your rifle's potential with factory ammo, while also leaving you with good brass for reloading. Both loads are also typically inexpensive.
Another good option to start with is the Hornady Varmint Express ammo. I have found it to be more reliably accurate than the Superformance loads. It is available in 40, 50, and 55 grain VMAX and is also typically reasonably priced. You may wish to try all three bullet weights, though the 50 grain loading is the pick of the litter, IMO:
https://www.midwayusa.com/product/8...ion-22-250-remington-50-grain-v-max-box-of-20
As for handloads, I recommend starting with IMR 8208 and/or RL-17. As for bullets, go with 50 VMAX and/or 52 ELD-M. In a typical factory chamber, these bullets will yield a base-to-tip OAL of around 2.470 to the rifling. IME, they will shoot their best seated to around 2.430, which is substantially longer than factory ammo (I believe this is the key to making a 22-250 shoot).
As for optics, the 22-250 isn't hard on scopes, so there can be quite a bit of flexibility in the price range(s) of the scopes you are looking at. The scope on my 22-250 is a 6-24x44 BSA that was a $125 Midway special and is, to my knowledge, no longer made. It has served me well and I am very fond of it. Aside from reticle choice and the desired magnification range, I believe an adjustable objective of some kind (I prefer side focus) to be an important feature.
Here are some deals currently available that may interest you:
https://www.midwayusa.com/product/2...x-44mm-side-focus-dead-hold-bdc-reticle-matte
https://www.midwayusa.com/product/784269/bushnell-ar-optics-rifle-scope-45-18x-40mm-side-focus-matte
Great Deal on Vortex Viper PST 6-24x50mm — Save Hundreds « Daily Bulletin