Planning and building a web project can be a huge undertaking. If it's done right though, your website will become your most valued and willing employee - leading new clients through an easy journey towards your goal.
As long as you know what that goal is... and who you want to lead to it.
Once those questions are answered your website developer (or you, if you've decided to DIY) will be several steps down the road to a profitable site that does its job for you.