Catrin,
apart from the SIMPLICITY advice, no one has said much about design. A few simple things you might consider that will make your pages look more professional:

1) As has been said, page 1 is the most critical page, and should tell people about who you are and your taste as soon as they open it. It should be a portal to the rest of your site, and should be very fast-loading;
2) You should consider designing the whole site: like a special edition of a magazine. For instance, you should find a font and a colour and perhaps a design logo that you like, and stick with it throughout. You should repeat your logo on each page -- it helps to hold the site together visually. There are important visual things about font types, serifs, etc, that you might want to check out a design manual on -- virtually everything in any standard print design manual is important for the Web. No clutter, ease of reading.
3) Remember that on each page you need to ensure that the reader can click back to the first home page. This is just Internet manners. You don't want them to have to go backwards using the browser. It is also good manners to provide Other Links to other sites of possible interest. It shows that you are not selfish.
4) Check out your page on someone else's machine when it is up. There are all kinds of things that may happen in terms of margins, colour, etc., that your machine may smuggle in without your knowing it. This is less prevalent than it was, but still happens.
5) It was mentioned above that you can steal stuff from other sites, but it wasn't completely clear how you do this. Keep in mind that not only can you save the printed stuff on any Web page, you can save the whole Web page (check out your Web browser) complete with all of its hidden HTML coding. Then you can muck around with it all you like. This is how most of us stole stuff in the beginning.

yours, Peter T.