I use PSPX, so not sure how different it might be from PSP9. I use the selection tool to highlight the letter then Ctrl+C to copy and Ctrl+L to layer it on your page.
A great site for free fonts is
www.dafont.com Just download the ones you want (i usually download to my desktop to make is super easy) then unzip and stick in your Windows-Font folder. They should then show up in your PSP.
You can get freebies from all sorts of digital scrapbooking sites including here at SBB. There are also stores that you can buy kits, alphas, brushes, etc.
I'm sure Tracey, our resident PSP how to girl

will chime in with even more for you. She is a master at PSP.