how to setup a print server?

You do not give much information to work with. But I will assume some things. Here goes.
1. Install the jetdirect box on the network.
2. Using Jet Admin, setup the jet direct box. You may need to change the ip of your computer to communicate withit the first time. Once it has been configured, you will need to change the ip back to the original.
3. If running NT, install the port to that IP. This may mean installing 'Microsoft TCP/IP Printing' service in your network services. Then add anLPR port in your printer services. Point it to the IP of your JetDirect box.
4. Install your printer driver and attach it to the port you just created. This is not a network printer, yet. You are installing a local printer.
5. Once the printer is installed, share the printer to the network.
6. Then from other computers, install the printer using that network share.

On Point #3, if your computer is a
Win 95/98/ME, then install a JetAdmin port to the ip on the JetDirect box. Then install your printer driver to that port. Then share it. Look at the info above for the details.

Best of luck