It depends which licensing model you use, i.e. per-device or per-user. If
you use per-device, you'll need 7 Terminal Server CALs + 2 more Windows CALs.
If you choose per-user TSCALs you'll need 1 Terminal Server CAL per human
that logs onto your TS, same thing for Windows CALs.
2003 TS Licensing
2003 TS How to articles (should help with you planning)
Microsoft MVP - Terminal Server