Trying to think of a tool checklist. I'll add to it if I remember more:
Allen keys - tightening bolts
Chain tool - cutting the chain to size and installing new chain
Cassette tool - installing the rear cassette
Cable cutters - cutting all of your cables neatly
Headset/bottom bracket press - pressing the BB and headset if needed. Research what kind of headset and BB you have
Hacksaw and fork saw guide - cutting the excess from your forks. This can be done with DIY tools
Torque wrench is highly recommended
Allen keys - tightening bolts
Chain tool - cutting the chain to size and installing new chain
Cassette tool - installing the rear cassette
Cable cutters - cutting all of your cables neatly
Headset/bottom bracket press - pressing the BB and headset if needed. Research what kind of headset and BB you have
Hacksaw and fork saw guide - cutting the excess from your forks. This can be done with DIY tools
Torque wrench is highly recommended