I am not sure if you have started your pathway to financial freedom properly, and have a clear purpose, or you have a rough idea of your purpose, and you are now trying to find realistic rewards so you can move on with the rest of the planning stage.
Taking your last point first, many web designers charge more for their work than some companies can afford. You have to decide if you are going to target the top of the market, the cheap end, or somewhere in between. This ties back to your first question - how much do you charge?
These basic questions apply to every business, but different strategies apply in different situations. Usually, you have one piece of the jigsaw. If you have no idea about any of your three questions, then you are going to have to do some research.
What you should charge is based on what you need each week, divided by the number of hours you want to work. That gives your hourly rate. Next, lets say it takes you three hours to design a webpage, then simple maths gives you the page rate. But you should double or treble the number of hours to cover your research, marketing and admin time. Let's start with 10 hours per page at $35 per hour, so $350 per page. I am assuming this is for a template that your customer can use for several pages.
There is no such thing as an average price, because it is impossible to know what everyone is charging for their work. You can research your own average by checking web page design prices on the Internet, or by telephone. Then you decide where you pitch - above or below average depending on the quality of your work.
The final test is the market place. You propose your price, and see what the reaction is. If it is an easy sale, think about raising your hourly rate in future. If you get laughed at, consider where you can trim costs and offer a cheaper design at a lower price. If you focus on your customers, and learn what they want, you will get better at pricing each job. Be prepared to earn less until your reputation allows you to earn more.
You can see the overview of how this works on my financial freedom pathway, but the detail requires good business planning. for a small business, this does not need to be elaborate. Over the next few months, I will build a resources section so that Freedly members have access to reliable low-cost business tools.