We'll begin play at 6th level.

We'll go with point buy, take average HP at every level.

Feats and multiclassing are allowed (I void the ability score prerreqs.)

Tasha's variant race and custom race options are in play. Everybody starts with an extra feat.

You begin play with an uncommon permanent magic item of you choice and 100gp in addition to the equipment brough tby your class and background.

Allowed sources: PHB, Xanathar's Guide to Everything, Tasha's Cauldron of Everything, and Enworld's a Touch of Class. (If you have it, if you don't have it, I can help you quoting relevant passages)

Other sources can be allowed, I'm likely to allow 3pp material, particularly if it's cheap and/or free.