Hi Melissa

I can totally relate - every little decision we make for our businesses feels (at least initially, during startup) like a *huge* deal, almost as if our success depends on that decision.
You're right that it is a big step toward making your business 'real' - go for it! Once you've got that site up and online you can move on to tackle more of your to-do list and start marketing and networking to bring in those clients that will make it all worth while
As to hosting, there are some great recommendations right here in this section of the site (
Domain Registration and Hosting). I can't say I have ever used Komposer so I'm not sure what kind of hosting environment you need, but I can highly recommend AceNet hosting [ace-host.net] - they are so great all the way around and have awesome customer service.
Whatever direction you take your site, know that we've all been there at one time and are excited for you!