Hey mate.
- Castrol Edge is a little bit fake I reckon, better to go with Mobil 1, probably cost less too.
- With the air filter, if you want to keep the stock box, I would recommend a HKS air filter they come in what looks like a green sponge type layout, they are good from my experience.
- Timing belt as usual is every 100,000 km
- I think around every 5000 km is good to change oil and plugs if you want.
- From what I've heard copper plugs are the most responsive especially if you re-gap them.
Hope it helps