Congrats and welcome.
Tool list:
Decent socket set (recommend 12 point sockets)
Decent ratchet ring spanner set
2 x large shifters
large 1/2" breaker bar
There will also be an assortment of larger sockets you will need but you can just buy them individually when needed. I would also look at a torx set that will fit your socket kit. All these items will probably cost less than a major service so it will pay for itself on the first service