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You can get a lot of different opinions in answer to your questions and none (or not many <grin>) would be wrong.
What you can even do is download apache, install it on your home machine, and start experimenting. I find having a local test system invaluable.
It's a great opportunity; definitely jump on it. 10 pages shouldn't be too hard to manage.
You should use the learning time to get to grips with your editing software, also get used to using FTP (software for movilg files from your PC to the web host).
This is also a great time to make changes and improvements to the website. Get ideas and suggestions for the company as to what changes they require.
My main concern is you have no experience of web development and the company have asked you do take on the development of the company website.
Main suggestion, get reading :)
If it's important that the site ranks in the search engines you better learn at least the basics of SEO.
I don't have any experience with web design or maintenance... I would like to use Dreamweaver8 if possible.
In the first instance you should learn HTML, that's what web pages are ultimately composed of (even when generated by PHP &c.)
The appearance of the HTML can be modified by using CSS, from a simple suggestion to the browser to display bold text in blue, to ludicrous suggestions of positioning blocks of the document in silly places around the viewport (which rarely work properly).
I'd visit the local library and seek out some books on HTML, I'm probably not allowed to recommend any particular titles, but a well respected publisher of technical computer books does a good "definitive guide" to HTML <g>
I can also suggest a series of books, 'Visual Quickstart Guide', they have books on just about every aspect of web programming, might I suggest starting out with either a strict HTML book, or the one on HTML, XHTML, & CSS. Start one at a time and before you know it you'll read the PHP*MySQL book and will end up making your boss quite the database application!
These books are all available online (Amazon) plus you will most likely be able to find them in your neighborhood Borders / Barnes and Nobles etc..
Not only are these books great, they tend to run $15-$30 each and get to the point as opposed to others that run $30+ and have a lot of stuff in them you'll never use.
At the same time, teach yourself HTML and a bit of CSS as well as the basics of image editing. No WYSIWYG editor that I've seen can replace manual control of the code. That requires some deeper understanding on a long run.
I use AceHTML. It puts the tags into the code for you, but you can see what is going on in the code. Then test it in your browser and change it if it's not what you wanted. You quickly learn by trial and error. But learn the basics of HTML first.
If you only ever use Dreamweaver etc. and never learn HTML, it is like flying a plane without understanding anything about aviation or aerodynamics. You may also be tempted to shove in a load of gimmicky stuff you don't need, just because you easily can. I'm sure that's why there are so many badly conceived, user-hostile, bloated websites out there.