For the mk3 the service light can be done on the dash with no tools the inspection light will need Odis/vcds or similar
Tools very basic for the service not sure on your engine but
Sump 19mm across all engines
under tray t25 (some engines have 3 t45's at the back)
32mm oil filter tool (1.8 and cupra use 24mm) 1.2tsi use 77m oil filter socket believe 15 sides
air filter t25
Fuel filters (diesel non exeo) T20
Major service on a 2.0 184 or 1.8 tsi can be done in less than 15 mins from driving car in to getting it out - paper work filling out health checks etc
Having done so many miles I've had the spark plugs replaced twice already, both times the dealership broke some of the coils. Apparently they are very brittle and easily crumble so be careful removing them.