I am trying out landscape photography currently. Currently planning to buy Canon 10-18mm and polarizer filter. My question is:

1 - What kind of polarizer should I check out if I'm on a budget.
2 - If I decided to invest in the cokin holder system, should I get the Z series for this lens or the P series should be enough?
3 - If I invest in the cokin holder system, will I be able to use Lee filters for future upgrade?

I am very new with filters and it hurts my head studying about it. Really need some advice here.

Wow. Thx for the very detailed advise and insight. I am actually currently confused on whether to buy canon 10-18 or Sigma 17-50 f2.8. However, I feel like buying the Sigma won't be giving me any better quality photos than my kit lens for landscape as I don't really need the wider aperture since I'll be using tripod for landscape anyway. That's why I decided for the 10-18. What is your opinion?

In any case, using filters with holder setup shall give a better result than the one attached on the lens am I correct?

I finally ended up with the sigma 17-50mm f2.8 and I am loving it! Now I can get rid of of my kit lens.

As for filter, what do you think about this set? I have not find any review or information regarding this brand JYC.

https://forum.lowyat.net/topic/2907346

Or maybe I can just buy the bracket and use filter from Cokin?