Wellcome to the addiction
I have a trio of recomendations for new guys.
Tunis43: for me the best desert title in the serie (i like Tobruk and dont find bad at all Middle east from MC) a good selection of scenarios and fluid battles
Budapest45: like Tunis43 interesting scenarios and covering a rare battle for a WWII title, maybe here my only complain is the size of infantry units... they are a little small and i dont like how win fatigue btl made of 200 soldiers but apart this is a good title.
Salerno43: 3 battles in one, maybe for me he main interest is in Krete battle a pure infantry combat and the best airborne scen in PzC series, Salerno and Anzio are not bad scens to.
Are a lot of good options, some years ago i recomend Stalingrad to... maybe the only title i dont recomend is Sealion, to be the only what if in PzC i see it a little... poor, not a good selection in medium scenarios and lack of what ifs... for example an italian expeditionary force made of 2-3 infantry divisions and 1 motorized/mech/armored division, Volunteers units in British army, i think in other wargames where appear USA units and reinforcement brigades equiped with USA weapons and maybe some polish, french units.