C# SSLSTREAM Problem

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C#

stream

certification

SSL

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First this is my first question here at codeproject so i hope i find good answers that satisfies my needs. Below you will my problem exactly

●How my program works

1- TCP Listener [Server]
2- TCP Client [Client]

During Account Login:

1- C > S : Username&Password [Encrypted using blowfish]
2- S < C : Invalid\Valid Login Credentials

●What i want to achieve

Making sure that the server which my clients connects to is the real server and not any other fake server, and provide the best secure communication between my client and server

●What i have tried to

I tried to use SSLStream with a self signed certification but i don't have any clue about how to achieve what i want with SSLStream Also am i forced to pay for certification !?

NOTE : I can't afford paid certification cuz it is 2k++$

●Conclusion -Concluded Question-

I want a good OVERALL explanation of how SSLStream works, how to make sure that the client connects to the real server, Also that the client is the real client