Scale first
A digital scale reduces ambiguity in flour and other compressible ingredients and makes scaling formulas easier.
Pan size and material
Pan dimensions affect batter depth and heat flow. Dark, light, glass and metal pans can behave differently, so recipe and manufacturer guidance matter when substituting.
Mixing tools
Bowls, flexible spatulas and whisks cover a large range of mixing jobs. Stand mixers and hand mixers are convenience/capacity tools rather than requirements for every baker.
Cooling
Cooling racks allow air to move around baked goods and pans. Cooling is part of texture development for many recipes, not merely waiting before storage.
Temperature
An oven thermometer can help identify a consistently inaccurate oven display, while an instant-read or probe thermometer can be useful where recipe guidance specifies an internal temperature.