welcome! take your time, learn about the brand and explore the many options.
there are several schools of thought when it comes to panerai, with one key school saying that the more simple, the better. the most extreme examples of this include the 000, 112, 176, 210, 232, 292, 372, 390, 562, 643...all of which are manual wind, two hands and the classic 3/6/9/12 on the dial. these are referred to as "base" models.
beyond these most "pure" panerai are many options.
some of the traditional ones that add a seconds hand but retain the manual include the 005, 111, 177, 422 and 564.
after that, GMTs include the 88 and 320 (auto) and 233 (manual). there are some other recent ones i can't remember, mostly because they have faux patina, and i'm not a fan. ;-)
as stated above, the 233 is a fantastic option. try to buy used to save some money and avoid depreciation (depreciation mostly because the MSRP is so $$$$).
then there are autos with modified ETA movements (104, 164) and in-house (312 and other 1950 models, like the 359 mentioned above).
then there are subs and chronos....the list goes on and one, depending on what you want and your budget.
oh, and you might want to consider case (bettarini luminor? 1950s luminor? radiomir? 1940 radiomir?), material (SS? Ti? ceramic? composite? PVD? PM?), whether a long power reserve is important and type of lugs (screw? pin? quick change?).
good luck!
