I recently started ancients myself. I have approached ancients with the same process I approached U.S. coins years ago:
1. Read
2. Study & Learn
3. Buy the right piece first.
Doing these in any other order can prove problematic! Avoid "problem" coins if you can. Damaged, bent, etc. These will be hard to get rid of later. For ancient coins, a binocular microscope (10x - 30x) is very helpful to me. Bought mine on
Amazon for $120 and makes the reading of the ancients a whole lot easier.
I have honed in on the Byzantine Empire coins. I don't really know why other than the history that goes along with them is quite fascinating.
Good luck in your venture!