1) Not as long as the USB cable is a standard length.
Connecting multiples in a daisy chain may require boosting.
2) If you don't have Access on the new PC, you aren't going to be able to use the database. You'll need to install a copy of Office with Access on the new PC. Don't expect to be able to transfer the program from one PC to the other, you'll need the installation disks.
3) I don't use laplink, but doubt it will do other than transfer what it's told to, it's not as if it's going to copy "empty" disk-space as well.