If you want to learn to ride, definitely take classes and do not try to do it on your own or through friends.
BC Safety Council has an excellent course and it isn't that expensive. The first part of the course used to be (think it still is) at Boundary Bay Airport, where you learn to ride in a large paved area that is a safe environment to help you learn and develop basic skills No cars to worry about, and the area is large enough that its not crowded and you can develop quite a bit of speed. They used to start you with small (125 cc or so) Honda motorcycles. When you master the basics and pass a simple test, you sign up for the street rider course. The street rider course uses larger motorcycles and is conducted in small groups of only 4 or 5 riders and 1 instructor. Overall, an excellent course both for value and for skills development. You can take the course as many times as needed to pass and get your licence.
I took it a number of years ago, even though I've had my motorcycle licence for years before. It was inexpensive and I thought it would be a couple of fun weekends (it was!). Even though I'd been riding for years, I admit I actually learned some things that have made me a better and safer rider. The course I took with BC Safety Council was at Boundary Bay and included everyone from 16 yr old boys dying (pun intended) to quickly get onto high-power crotch rockets, young ladies who were hesitant about participating, "re-entry" riders, to a 77 year old grandmother (who decided it was something she always wanted to do). Oh yes - the grandmother passed, but two of the 16 yr old guys failed

.
I should add for Mia and the other ladies on the board that all the ladies that took the course thoroughly enjoyed it and all of them had a blast - even those who signed up reluctantly and seemed to have been pushed into it by their friends.
The BC Safety Council and similar courses are a great way to spend a couple of weekends, especially with friends. Even if you don't ever want to ride on streets, the basic skills course (in a large parking lot or at Boundary Bay airport) is a blast! Lots of fun and a safe and cheap way to decide whether you actually want to ride. Another benefit is that by talking to other class participants and the instructors you also get a much better idea of what type of riding you might want to do and the type of motorcycle best-suited for that type of riding.
If you do get your licence and ride the streets, please get and wear good protective gear (regardless of the type of motorcycle you ride). If you can't afford the best, don't worry because there's lots of good, inexpensive gear available as well. There's also lots of good used gear available fairly cheaply (e.g. Buy & Sell or on the internet).
As to the type/size of motorcycle, a lot of that depends on your preferences, the type of riding you want to do, how often you'll have a passenger and what type of loads you want to carry. For example, if all you want is something for a short 10 minute to ride to Starbucks so you can park it and sit there for hours while everyone admires your bike, then probably only a Harley or an exotic European bike will do. If simply want to hop on a bike by yourself after breakfast and ride to Kelowna and back through Princeton before 5 in the afternoon stopping only for gas, then probably a high-speed touring bike (e.g. BMW R1150RT, Yamaha FJR1300 or Honda ST1300) better fits your needs. If all you want is something to ride to the nearest logging road so you can explore the rest of the day on the logging road, probably a dual-sport (e.g. Kawasaki KLR 650) better fits your needs.
However, if you've never ridden before and aren't certain as to the type of riding you really want to do, then try to swallow/curb your pride/ego and avoid the 150 hp, 1000 cc sportbike and stick to a mid-size entry level bike for the first season or two. There's lots of good bikes in the 650 to 800 cc range for a range of riding styles that a beginner won't outgrow for years, if ever. There's also a lot of good, used low-mileage bikes available that you won't be heart-broken (or "wallet-broken") over if you accidentally drop it. Good used bikes also hold their re-sale value quite well. I recommend you start with a non-faired bike (often referred to as a "naked bike"

) since plastic parts are easily damaged and are very, very expensive to replace. Also, look for a bike with a reputation for reliability unless you're mechanically inclined. After a season or two, you can always trade up to a newer, faired bike if that's what you really want.
Check out some of the numerous motorcycle-specific bulletin boards that are on the web. There's quite a few for local motorcycle clubs as well and most members are motorcycle enthusiasts who are more than happy to help newcomers.
PM me if you want further information.