Also as a reminder, the PTR will issue an additional backup for Ladder testing which is scheduled to be available from the 16th and D2R Items 18th of February. After two weeks of the initial phase (January 25th to February 9th) the users will be using the current PTR. We can guess that the patchwork will be under test for 15 days. So, Patch 2.4 and Ladder season 1 are expected to be released from March 7th until March 11th, or from March 14th to 20th 2022.
However, there may be additional modifications in the Ladder PTR update before it's launched in March. This is expected to be the last PTR before it's official launch. Through this process they will get rid of bugs that could affect playing experience.
The first Diablo 2 Resurrected Ladder season is yet to be released but still, we have a glimpse of what's to be revealed. You should start with Sorcerer class, but what's the reasonbehind this?
Different classes come with different levels of buy Diablo 2 resurrected ladder items complexity. If you're considering Necromancer you will find numerous skulls that are inside the Maggot Lair whereas, for Druid they will be wrestling through The Arcane Sanctuary.