Making a server

I have a few questions about server hardware and building one. I don't know if this is the right forum, but oh well sorry if it isn't.

Say I wanted to have a server in my house contected to the internet through my home network. This computer is connected by CAT5 and the software is installed. Would the router be able to handle the load?

If the current computer I use to use won't work I was planning on building one, but what RAM and Hard Disk is good to have in it and what is an average for Co-Location then for I don't want four computers in my house with no room? (Sorry that doesn't go here, but I ask anyways)

Also can a wireless computer connected to a router be a server? because I don't remember if they have an IP.

 

 

 

 

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