I would go big by hosting a free event to promote my event planning services. I'm talking about a nice event, with dueling pianos and chocolate fountains.
Pick a date about 3-4 months away and book an event hall or restaurant for a few hours. Make sure it is not cheap, and that you have to pay a deposit. The key is to lock yourself in so that you have to do it.
Spend a week selecting a theme and your niche market to invite, which should be a group of professionals who need event planning services (real estate agents, sales professionals, travel agents, banks, etc).
Build a website for your event. Also tie it to your event planning website to showcase what you can do.
Make a flyer promoting your event that includes your theme. Make it classy. Email it to a chamber of commerce directory or just go through the yellow pages and find businesses to invite. Include two free tickets in each letter.
Make follow up calls to the owners of key businesses. Don't forget local charities who always are organizing balls and dances, etc.
Aim for 50 people to attend. Spend time planning your kickoff event. This will be your resume and your training. If you do it right, you will demonstrate your skills.
If your event is a failure, you should try again with a different niche or decide whether it is something you can continue to do.
If it works, you may get a few requests to plan parties for your event attendees. I do not know how much profit you can make, but I assume for at least a year it will be minimal or even a loss as you advertise and build up a client base.
I know of people who did this and one makes $25,000 per event, and only does four events per year.
(I didn't intend to type this much; May have to write a Hub about it :)