"HOW IM GONNA ENABLE TCP/IP to server"
Well, for that you first have to make sure that the server is on a LAN segment which is accessible from the stations. If server and clients are on the same subnet (for example, 192.168.0.0/255.255.255.0), they will be able to communicate with each other on the LAN.
Regarding the configuration of the SQL Server instance, there is a control panel called 'SQL Server configuration manager' which allows you to check whether TCP/IP access is enabled; it is enabled by default, so normally you should not have to change anything here.
Then, for the clients to be able to communicate with the server, you have to provide them with a valid connection string. Here is a link which will tell you what connection strings you can use to access a MS SQL Server instance:
SQL Server Connection Strings[
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It will not give you directly what should be the connection string for your specific instance, but instead inform you on the meaning which the values in this connection string carry, so you can adapt it to your actual configuration.
When you will have determined the proper connection string, then your client application will be able to access the instance of SQL Server. From here, I advise you to search for "SQL Server .NET client application" on google, for example; you will have access to a huge amount of examples and tutorials on the subject.