It depends on the company that hires you. I've been a dietary aide for over 4 years, and it varied from $9.00 to $11.00. I can't guarantee it wouldn't be less or more, but that seems to be the median.
Typically you multiply the hourly figure by 2080 to get a yearly figure. $22,048. For a very quick estimate, just think $20,000 a year for every $10 dollars per hour.
It depends on the event, a house party or wedding could make around 30 to 50 dollars and hour while a club or hotel could make you 150 to even 300 and hour :)