Many scrapbook instructors encourage their clients to start scrapbooking from the current pictures and move backward in time, so the task doesn't seem so overwhelming. for digitizing your photos, though, I'd like to suggest for a project like this that you start from the beginning -- your oldest paper photos -- and move forward. Take 15 minutes once a month and work through 20, 50, or even 100 pictures, turning them into digital imagines and archiving them. Imagine the joy you'll have as you remember old times, old friends and fun memories.
Take the time to save your photos. Your children's great-grandchildren will be glad you did.