Someone to set my pricing, and find out why my web adress is not on-line

I am new to this, and have the prices automatically set up in my account with Shopify. I am not sure of my cost, so I am scared to adjust these prices, even though they seem way to high for anyone to purchase. I want to make sure that I am turning a good profit, but don't want to rip people off either. I am also not seeing my web address on-line, which I purchased from Hostinger.