3/. Research your topic/s:
You could have one topic on your website with different link pages covering different parts of the topic, or you can have a themed website with a new topic on each page.
You could have one to five different topics, (or one topic with five different parts) with the Index (Home) Page linking it all together.
The, choice of topic/s is open and could be an interest, hobby, something you want to learn about, sport, music, actors, singers. But a main requirement is that it must be educational and non-violent.
In researching your topics you will need text based content and images.
Images must be saved to your pics folder. Copy/paste will not work, as the images must be embedded in the page by inserting the image/s from your pics folder.
In gathering images you will be able to edit them in Photoshop, that is make a larger image smaller (but never a small image larger, as that does not work, as they will pixelate and become blurry).
Images need to be (or cropped to): Headers 900px, within page images - up to 900px - but within the content section of the page you could have images two wide (that's 450px each), four wide (that's 225 pixels each), or any combination up to 900px wide.