Is there a track near you? Riding fixed is just so different than gears. It feels great once everything is set up right as there's so much less to worry about. But it's not for everyone.

If your area (SEPA? ) is hilly then you'll really struggle on a fixed. I can climb okay on gears but get defeated by any hill over 10% on a fixed, and descending with your legs spinning like crazy is scary!

Also fixies can be a bit of a pain in heavy traffic as you often find that the pedals are in the wrong place for setting off again. Not a problem if you can trackstand (I can't) but otherwise you have to unclip, lift the rear wheel off the ground and rotate the pedals.

If you are using an old 10-speed then there is the risk of pedal strike in corners, where the inside pedal hits the ground and lifts up the entire bike. Not nice. Mine used to do this sometimes (it has 170mm cranks) until I put narrow Shimano pedals on it.

Think hard before committing any $ to this. Converting an old 10-speed to a fixed can easily cost $300. Converting to SS can be a lot easier: get the rear wheel re-dished and buy a sprocket and chain & see how you go.