The Anniversary Kit has a lot for beginners already included with it. The included powder measure is sufficient but Lee makes better ones as do many other brands.
For starters in answer to your question.... for case trimming (which a must for 5.56/.223) they state this in the anniversary kit product description
https://leeprecision.com/50th-anniversary-breech-lock-challenger-kit.html
"case trimmer to trim on your reloading press (
order cartridge specific Quick Trim Die separately), and a
Cutter and Lock Stud to trim your cases by hand. If utilziing the cutter and lock stud, order the correct
Case Length Gauge for the calibers you will be loading,"
A Hornady Reloading Manual
A better powder scale although the included one is accurate it is just very unconventional and slow. I have one and it is okay. But I upgraded.
Redding Imperial Sizing Die Wax
Calipers for measuring case length and loaded O.A.L.
Primer Pocket swaging die for taking the crimp out of military brass if you run into an occasional one or three.
A vibratory tumbler and tumbling media ( I prefer Lyman treated corncob)
A universal decapping die if you get a bunch of once-fired military brass that is still crimped.
I advise you don't in the beginning buy crimped .mil brass as that just sucks ALL the fun out of getting into reloading.
If you find a deal on commercially cleaned and sized and trimmed and decapped and primer pocket swaged used brass, go with that.
What barrel twist are you going to be shooting those 70-gr TSX bullets?