I'm good at it, and it's not a question of if the job will get done, I just don't know how much this kind of stuff runs...

People tend to pay according to quality and effort of work and experience of the worker. If you are just starting out, giving a low price might be a good idea.

There are four elements that go into a price: time, materials, overhead and
mark-up. I think it will be easiest to look at each of these in reverse
order. Note that these elements are for your own use only; I wouldn't
recommend sharing your calculations with your clients!

If you want to include a mark-up, remember these tips: apply a uniform
percentage across all the other elements; don't be greedy or you'll lose
business; remember that this is a great place for you to give something away
in the form of a discount.

Overhead is actually fairly easy to figure out! Take your monthly costs and
divide them by your time. That's your overhead! For example, suppose your
office space, utilities, phone, internet connection, insurance etc. adds to
2000.00 each month and you work 50 hours a week on your web development.
Assuming four weeks to a month, your overhead is 2000/200, or 10 per hour (in
whatever currency you are calculating!)

Materials are probably non existent unless you choose to use stock photos that
include licensing fees, or you wish to consider hosting cost as a "material"
cost. Use as close to actual cost as you can, applying your mark-up, if any.

Time is what you are selling. Your time is the true value in your website
development effort. Consider what is a reasonable amount for your time on an
hourly basis. Again, don't be greedy, but rather be as realistic as you can.
What could you earn for your work as an employee of a company? As a
freelancer, your time would earn a little more than you would be paid as an
employee because employers provide other benefits to their employees. When
selling your time remember that this fee is all you are going to get for your
time, and be fair to yourself as well as to your client.

Let's say that you have arrived at an hourly rate of 15.00, that there are no
materials involved, that your overhead came to 10.00 and that your mark-up
decision was 10%. 10.00 + 15.00 = 25.00, plus 10% is 27.50. There is your
hourly rate. That amount times the number of hours you work (plus the
materials -- in this case zero, with mark-up: still zero) is the value of your
effort and the amount you should charge.

If your client wants to know ahead of time what the total is going to be, you
will have to estimate your time. To do that you will need to have the client
give you written, detailed specifications for the site. When you then present
your estimate you will have to specify how you will handle changes or
variances from the original specifications that occur. The chances of changes
coming along are usually very high, and it is not uncommon for the total
changes to involve more time than you originally estimated for the entire
project. Be certain that you clearly handle this issue with your client in
advance of starting work; it has a very large potential area for
dissatisfaction in either direction of not handled properly.

Finally. keep an accurate and honest log of your work time. This is how you
will get good at estimating your time requirements. It's also how you will
justify your charges to your client, if you are billing on a time basis. Not
only will your estimating improve as you build experience, so too will your
ability to fine tune your rate to the market in which you are selling. Stick
to your formula. Don't suddenly start making guesses at the final number.
You need to know the elements so that you can adjust them as they change and
see the effect on your final number.

If you guarantee any type of placement on google or any search engine, you're just asking for a lawsuit. You can guarantee that their web site is up, but you can't guarantee google will even list it. It's up to google, not you.