Pick up a primer, like Culhane's Instrument Rating Groundschool. Know the IFR section of the A.I.P.. Learn all you can prior to forking over the cash, it'll give you a good headstart on regs and procedures and you can concentrate on the flying skills. Of course until you're taking the course some of it may not come together, but it'll help you get the most from your hard-earned money.
Pick up a Computer Procedures Trainer, either a pro one or Microsoft's Flight Sim, and spend a ton of time doing approaches and what-not on the King-Air (closest I think to the panels you'll actually be flying) with the flaps and gear down to keep your speed helo-like.
Concentrate on precision while flying VFR. Pick a rate of climb and stick to it like glue, same goes for rates of turn, holding altitudes, headings. Try to maintain an airspeed and climb and decend with your collective instead of cyclic. IFR guys typically fly with the same precision whether they are IFR or VFR, and shaking a decade of bush flying technique (at least mine) was difficult. Better to start the habit now.
I found all the regs and things to know a little daunting at first, but once you start to apply things on a regular basis it gets to be second nature, and you'll probally find (over time) the IFR much easier and more relaxing than VFR.
Once you get the ticket, I doubt CHC Global (International's new moniker) will pick you up until you've got some actual under your belt. EMS in Ontario is good for giving guys a start but be careful which base you get as some don't fly that much and it'll take you forever to get any real time, and Ontario isn't really known for it's IFR weather. The Halifax EMS op gets tons of actual and is busy. You'd be hard pressed to do better than Helijet as you get tons of actual in a heavy traffic enviroment flying with very experienced Captains, and you'll log alot of twin time rather quickly.
Best of luck to you