It sounds like a lot, but in reality you'll already have a pretty good idea what you might want to use. About 80-90% will be easy.
For example: FK, CK, PS, BJ are obviously rude words, which are actually better choices, because they're easier to remember.
BA, CW, SH and GF could all be animals. You can use friends' initials, famous people, or maybe just simple words.
Try a few solves where you choose letter pairs as you go, you'll be surprised about how much easier it is than you think. If you get stuck, you can try placing vowels in between two letters to make a word (for example, JM could be jim, jam, jem, etc.)
If the word is too hard, you can do a search and find lists that other cubers have made for inspiration. You can also try reading the blog post in my signature if you have no idea what I'm saying.
Good luck!