Hey Kevin...welcome
First thing I recommend, especially since you mention you're on a budget, is to wait for things to sell here instead of going out and paying full price at a store. Skimmers and live rock pop up for sale here semi-regularly, so you just have to keep your eyes peeled!
Regarding the canister filter...I have been running one on my tank with only carbon and a phosphate-binding media (Rowaphos or Phosar). Recently I've disconnected it, though, because as Christy stated, it requires fairly strict maintenance/cleaning, and I wasn't able to do so. I'm looking into integrating a sump and am collecting the parts to do so slowly.
If I had to do it over again....or if I were you....I would just get the tank drilled right now while you don't have anything in it. I'm sure there are even people here in Calgary who would be willing to help you do that, etc., including the plumbing.
Anyway...keep researching and don't rush. And again, welcome!