$ ?
Many have alot to say about this. I'm assuming you mean price from a business standpoint.

Only you can determine your price. You've got some good and some not so good advice.
My advice is
1. Make sure you charge enough to pay liab insurance.
2. You should charge enough to be able to pay people to perform the work including all labor burden. Taxes, Work Comp, etc
3. If you lowball, tell the customer you are as an incentive to use your company but to expect higher price afterwards.
4. Price varies by region and type of work.

I thought when I started that 45 an hour was great, but soon found out it was nothing. Your material mark-up should be at least double. Most jobs should get you up around 200-300 per hour. You will spend alot of time doing things you don't get paid for so as some have said they charge 20 something is a joke. Any journeyman should be able to find a job 20-30 per hour with bennies working for someone else and not have the responsibilities of be self-employed.