Welcome to the forum, Emma.
I think there are almost as many methods of designing ebooks as there are designers, and a lot depends on what format you want your ebooks to be in.
One common method for ePub ebooks is to use Sigil - there is a forum on MobileRead. There is also an ePub forum, and there are many tutorials including one by Pablo. I dabbled in website design in the past, and use an HTML editor.
Another very valuable forum is the Calibre forum, which will help you convert from one format to another.
But I've only touched the very tip of the iceberg; you will get more detailed advice from the many helpful people who post here if you are more specific about what kind of ebooks you want to write, and where you want to start from.
There is also a Writers forum if your main interest is in writing as such.
I hope this helps.
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