ShowMe,

For now let's keep it simple. You probably won't find any .223 brass or bullets for a while. You may be able find match bullets at Berger though. The 52gr is a good one for BR.

Take the brass you have and full length resize it, trim it, chamfer it clean the primer pockets, clean the flash hole and be happy. Take it to the range and work up some loads until you find what your rifle likes. Most BR shoots don't use a lot of ammo so I'd imagine you'll be able to make use of all of it if you have 50 or so pieces of each brand.

Take this time to learn the rifle, the game, handloading and just have fun in it. When you get better and supplies of .223 become easier to get you can buy better stuff.