If you're looking for a more classic Call of Duty experience, then you should start with one of the earlier releases, such as Call of Duty 4: Modern Warfare.

Call of Duty: Modern Warfare 3 (Standard Edition)\n\n If all you want is the core game and the preorder bonuses, grab the standard edition. Note that, this year, the PS4 version is cross-gen, meaning it also includes a PS5 copy. Likewise, the Xbox version works on both Xbox One and Series X|S.