Question From a Novice

HELLO GUYS,

How u all guys doing?Recently I brought a system and installed Red Hat Linux in it. I have also got a network card. My question is can i connect NIC to my system and use it as a client? I really don't want to buy another system.
I want to use this computer/system both as server and a client.
can some tell me how do we set up in such a way?

Thanks in advance.