Different people are using the computer in their scrapping in different ways. So don't feel like you need to copy everything.
The main thing to remember is to use acid free paper or cardstock. There has been some debate on the "safety" of inks but in general that is less an issue.
The use of a computer can range from simply printing digital pictures to doing entire 12 x 12 pages (which requires a printer capable of handling sheets that big and those are expensive! I just researched that.)
Personally, I have some software that lets me do journalling and titles in unique fonts and shapes. Although I find I don't use it all that often. More for a title than journalling. For me it is more a matter of laziness (my scraproom is on the main floor and the computer is upstairs) and convenience (I either don't plan ahead before a crop or the kids are on the computer and it is easier to not kick them off in the interest of peace and quiet). Also I don't mind my handwriting.
I do use my computer to scan photos that I need copies of or enlargements that aren't easily made by my LSS (for instance I have a 3 x 5 of my mother taken by a professional but want 5 x 7 for each of my kids' books and my LSS can't make those because of copyright laws). I also will scan newspaper articles I use the print out on acid free rather than the news print in my book - for safety and longevity. On occasion I'll scan and print out other things as well. For instance, I scanned a fabric patch my son received for a Scout trip, blew it up, and then printed it out. Cut the excess paper away and used it in the book.
So that is how I use my computer.
Deb