Help me about VPS

Hi, currently I have a 512mb ram 1 core vps, my question is

1. if I want to install phpmyadmin and cpanel to my vps, does it uses more ram or does it slows down my websites on that vps? sorry for this noob question because I saw someone said that phpmyadmin and cpanel use a lot of resources, and by that Resources thing I do not know what that person is talking about, is it on ram, cpu usage, or it is just storage, thats why I got confuse. please help me to understand this.

2. phpmyadmin…

Help me about VPS