You can keep yourself pretty busy reading up on knife making via all the forums and related sites.
This thread is really good for looking at different types of knives and their handle materials.
http://www.bushcraftuk.com/community/showthread.php?t=10436
Then there is the the FAQ thread which has a bunch of links for knife making tutorials, information sites, forums, and materials indexes.
http://www.bushcraftuk.com/community/showthread.php?t=8793
Micarta is nice/nasty stuff to work with. The dust is definitely not good for you and tends to get everywhere unless you work it wet. Wear a dust mask. That you can work it wet, and that it looks pretty good with just a 240grit finish makes it easier to finish than many natural woods which require fine sanding, then oiling.
As for where you can get it, in this country you can try:
http://www.wardellscustomknives.com/
or
you could order it from the US from Texasknife.com, or Koval, or Jantz, or K&G Finishing.
Places like Cromwell tools sell the O-1 steel that is a good bet for starting off. Mick Wardell also sells O-1 but its more expensive, however, he has the set up to heat treat your blade for you, and his process is geared for the brand of steel he sells. Other places sell O-1 also. If you only want a blade there are makers here and on British blades that sell stuff fairly regularly, or you can try Brisa, or maybe still
www.tregor.co.uk, or if you like the idea of a Fallkniven, I think Hennie do blades for those.
The kind of blade you get will determine the sort of handle you will need to work on. There are a lot more hidden tang blades for sale than there are flat tangs. You can use flat bits of 303 of 316 stainless steel as spacers on a hidden tang, but on a full tang you would need to do things differently.
You are probably best off getting a blade and fitting a handle. I wouldn't want to try blade filing without standing up, but handle fitting should be possible.
Your best bet is go go and spend a couple of days brousing around the linked tutorials, sites and so on.
Best of luck