Deploying c# wind app to the client server?

Hi,

I remember creating set up file to install VB win app to the client's machines.
It created a start up exe in the start menu and uninstall exe.


I have very small visual C# win app I have to give it to the client and the admin of the client site will install the app on the server.
A whil back I distribute the vb exe file and installed on the client's machines.
But this can't be done any more due to the security lock down.
1) Should I go with the clickonce or windows MSI?
When I tested the clickonce, it install in the startmenu
2) How can I tell where to install?
3) Also it didn't include the uninstall exe? How can I create that also?
4)in the property of the project in VS, it requires me to sign security and application.
Why is that required? It also create a pfx key.
5) I have to write up the install manual. Does the admin of the server at the client site require to do something?
I read some where the admin has to sign it.
What does this mean? (signing) Why does the developer sign and the admin of the server sign?

I googled and read a few deployment tutorial. The most of them pretty much same.
What will be steps to deploy this app to the client's server?