Hawk, you are asking a great many questions, all at the same time. Let's slow down a bit, and see where this is headed;
a. HF propagation is worldwide, dependent on many factors, such as the time of day, frequency, solar activity, the season and many other things. One of the most complex concepts a newcomer to HF has to understand - and notice, I didn't say master - you don't need a degree in geophysics here - is how the sun and earth interact, and how a HF signal is bent to go around the planet. This website is an excellent place to start - note you will need a Flash player to see it, and if you are using NoScript with Firefox, disable it while you are here...(all links are in blue)
Propagation Primer - Flash Movie by AE4RV
b. The kind of receiver you get will determine how you program, and it will be quite different from a scanner. Some receivers cannot be programmed at all, some use a dedicated PC to run, and there are many others in between. Your budget is going to be a constraint, but even more important, what is it precisely you want to hear? HF is a vast territory, and perhaps the best way to get started is to start reading a few things. Let's start with our own wiki, which has a HF page that touches on each of the available services...
HF - The RadioReference Wiki
As a good starting point, since I see you're in Ontario, the ODXA website should be on the top of your list. Their bulletins are now available in PDF format. They even have a dedicated beginner's column, and some webpages to help you along.
ODXA | Ontario DX Association
If you happen to run into Dr.Harold Sellars or Sheldon Harvey, tell 'em Mike Agner sent you.
c. As to antennas, that depends greatly on what receiver you get. Before tackling that particular nugget, try to settle on that first - then tackle the antenna. It will be quite different from your discone, and there are MANY different flavors.
That should be enough for now. 73 (ham shorthand for 'best regards') Mike