You don't need to have one stick per year ... one will do you for life! Just set up folder that says 2013 and then a load of folders then next year just do the same.
Yes you save it straight to the memory stick
Blimey, I'd ask why you scan everything but sure you have good reason.
One memory stick will have far more capacity, just bung it into one of the several USB ports you have on your laptop / PC and simply save the file. You can create untold amounts of folders and save your various things in...
Is the correct answer .. use them as weapons against squirrels and pigeons and go and buy yourself a stick ... you really shouldn't be buggering around with discs