Journal articles in medicine are often very specific. You will occasionally find a nice overview among "review articles" which is an article/content type in many article databases. But I recommend you include books especially for your individual disease presentations. Most book content will have excellent suggestions for further reading in the References/Bibliography sections.
Also seek books and ebooks in our catalog, MOBIUS catalog and Becker Medical Library catalog. But the online databases below contain fulltext of the most recent editions of many of the standard texts so I recommend you try them first.
Searching for media, such as pictures, charts, or videos? There is a lot of great information on the internet but there are also mistakes, lies, and other inaccuracies. I would probably use Google Images, Wikimedia, and general search engines. But choose critically! Here are two sources where results are more likely to be trustworthy.
Research guides which you may find useful in your projects.