For your first reloading perhaps it would be better if you buy some new brass,if you get quality like Lapua,Norma,Hornady,Remington etc you don't have to worry about case prep.
You can pick up packs of 100 fairly cheap then you just need large primers,powder and projectile of your choice.
If you get some 110 gr Vmax or anything else around 110-120 grain with start loads you will have some lower recoil ammo which will leave smaller bruises