RAM does not depend the speed at which games run. Although it does help. Video cards are what does. So this question can not be answered without the information of your video card.
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Typically, Minecraft usually uses 300MB + RAM - Usually about 600MB, but it is automatically allocated up to 900MB RAM (if your computer can handle that). Basically, the more RAM you have, the better Minecraft will run.
Depends on how much RAM you have if you have a good amount 6 gigabytes or more is pretty good for minecraft than you can search how to dedicate ram to minecraft. Or just watch this video...
1. Your computer doesn't have enough ram. 2. There is too many people on your server. OR 3. Your server doesn't have enough ram. :)
It depends on how many players and plugins you are wanting on your server at any given time.
Why would you make a minecraft server to play on it urself? It wastes RAM and time.