Hi JakieMummy,
Welcome to BrillKids
And please don't feel any guilt ever by working you are providing for your child. Sometimes I feel guilty for not going back to work, especially since i spend so much on early learning materials. Yes you are definitely in the right place to give your child a head start.
Once you go to the print screen on LR you can click on the tab Categories and print the flash cards by their category without having to select each individual word.
Please let me know if this helps you.