Your questions are very general, but I'll see what I can tell you that will help you:
Since you're using a LAN, the most likely solution for you first problem are the TCP VIs. How to work with them is heavily dependant on what it is exactly that you want to do with the server (just see that's its there, communicate with another program there, read files and so on...).
The connection through GPRS would require that you talk to your device. If it is connected to the computer through USB or serial, you can use the VISA communication VIs to talk to the device itself. Then, talking to the server is the same as in the first question. You will need VISA installed on your computer.
You can find examples for using both TCP and VISA by opening the example finder (Help>>Find examples) and searching for TCP or serial. In addition, you can search this site for TCP or serial tutorials and find some great things.
To learn more about LV, I suggest you read the LabVIEW user manual. Also, try searching this site and google for LabVIEW tutorials. Here is one you can start with. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide.
If all these don't help you enough, or if you're pressed for time, write in with more details about your setup and what you're trying to do and we will better able to help you.
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