Welcome Nathan. Congrats on your purchase of the VR. I hope you enjoy the car as much as everyone else on the forums.
There are a number of sites and places you will be able to get parts from for our Lancer CJ's, as its been in the market for such a long time. If you're lucky you might even be able to pick up some of the parts that you're looking for at your local wreckers for a cheaper price. Or as many have done bought from an online store or from another member or from a forum group buy or from Ofey our forum OEM Parts & Group Buy organiser.
All the best with your mods.
Just to make sure you don't end up buying wrong parts, to clarify our car model is labelled CJ not CH (& properly labelled the CY4A for the NA models). And since your car is a VR its engine will be an 4b11. And some overseas stores label our cars the Galant Fortis.
For more information about wheels and the sizes you can put on, check out the wheel threads. But if you get lost and cant find your answer in an already made thread don't be shy and ask on the chat or make a new thread in the appropriate sections.
All the best and welcome. ^_^