I agree with Rhonda - rather than focus on trying to achieve work through 'bidding' sites I'd recommend investing some time and energy in establishing a true business - this means (at the very least

)coming up with a list of services, giving some thought to who you'd like to market to (who would best utilize the services you are able to offer), and of course deciding how much your rate(s) will be, what your business policies are, etc.
I know it sounds like a lot of work - and it is - but it's worth it. Being a VA is a business, not just a 'side job', and if you treat it as such it's more likely you'll find a greater level of success.
Relying on bidding sites alone for work is neither a long term possible scenario for viable income, nor much fun when you consider the $3 an hour Rhonda mentioned. Applying yourself as a business owner makes all the difference!
Good luck!