There are a few options. Sometimes, subscription-based services like Comixology or Kindle Unlimited have a collection of Star Wars comics. Also, check out the official Star Wars website for possible links to authorized reading sources.
Star Wars wasn't initially based on comics. It started as a cinematic concept that later expanded into various forms of media, including comics. These comics often expand on the existing Star Wars lore and characters.
Star Wars comics can be canon. They're part of the larger Star Wars narrative. But it's important to note that the determination of canon can change over time and based on the decisions of the Lucasfilm Story Group.
Sure. There are several Star Wars comics that are considered canonical. They contribute to the overall lore and add depth to the franchise. Some of them explore events and characters not covered in the movies or TV shows.
Sorry, I don't have a definite place for you. Maybe do a search on popular search engines, but be cautious as many free sites could be violating copyright laws.