You can copy the save maps in the Baldur's Gate\Saves folder to and from your USB stick, yes. But for them to work on two pc's you'll need to have installed the exact same patch and mods on both, otherwise you might get errors
"We are at a very serious moment dealing with very serious issues and we are not focusing on the name you give to potatoes" - Nathalie Loisau
Game Banshee has a nice walkthrough on its BGI section.
I highly recommend that you do not use it your first few times through as knowing whats around every corner is a real spoiler. I am very happy that I never knew about any walkthroughs when I first started.
Keep it new for a while.
Once again time to give someone the boot to make room for Coran. LOL