how can i determine how much RAM and processing speed my website needs?

ANSWER TO THE ABOVE QUESTION Well if you are looking for RAM and Processor requirments, it means that you are obviously not happy with the current hosting plan. Most websites start with shared hosting and move on to Dedicated hosting. Best suggestion would be to take an intermediate VPS plan. You can look at the server resource usage report and you can observe it for a few months and if needed go for a higher or a lower VPS plan. All the best