File Sharing between two Macs

I have few questions about file sharing between two Macs. I have two computers connected to the same router at home. If I add a folder to shared folders list and allow access to "everyone" then I see the shared folder on the other computer and can browse it. If I choose "No access" to "Everyone" then I do not see the shared folder on the other computer. My problem is that if I allow access to "Everyone", then when I take the computer to my school, it will allow many other people access to those shared folders, which I don't want. My question is:

How do I restrict access to specific users, say only myself?
Can I set it up such that they need to enter Password before they get the access?
Also, in the users list I see 3 categories

MyName
Users
Everyone

Since, MyName is already present in the users list, do I need to add a new user if only I need to access the computer.

Thanks very much.

No one knows how to do this?

Go to System Preferences > Sharing > File Sharing > Options

Uncheck "Share folders using AFP"
Check "Share folders using SMB"

Once this is done, the connector will be required to enter the password for the host computer's account. This worked for me at school.

Good Luck
~joe

Thanks very much Joe. I thought AFP was more secure than SMB. I will try what you are suggesting.