Egypt
Egypt in this time period is one of the successor states of Diadochi. When Alexander the Great died, his top generals carved out empires of their own and immediately begin to try and murder one another.
Commanded by Ptolemy I Soter, the people of the Nile are another fantastic option for players new to Paradox games. Incredibly wealthy with an enormous population, and a position that is easily defendable, Egyptian players will have a strong power base from which to expand.
Normally I wouldn’t recommend playing as the larger nations, as it can be quite overwhelming. However, Egypt really only has a single threat to worry about: Phrygia. Situated to the northeast, Phrygia is a massive land power, but they are quite often wracked by civil war and rebellion, and so are very rarely able to bring their full power to bear on you.
As your flanks are covered by your own vassals and the uninhabitable deserts of northern Africa, you can learn the game at your own pace, and expand when you feel comfortable.