I’m glad to hear it! There is a lot of very beautiful and engaging content as you level.
OK, so for information, yes, there is a VAST amount to learn, and see, in the game.
One of the biggest problems is that the game changes and adds more content from expansion to expansion. Every two years, Blizzard adds an “expansion” to the game. We are on the ninth expansion, Shadowlands, now. Each expansion adds a new continent, new raids, new dungeons. Each expansion raises the level people can rise to, and changes the gameplay, the spells and talents each class can have. There is a vast amount of information generated on the Internet every expansion, and those pages are not usually removed when the next expansion is released, so there is a lot of out-of-date information on the net as well.
Here is a video aimed at new players. It is two hours long, but broken into 38 short chapters, with timestamps, covering the main things you need to know, so you can easily find and watch the bit you are interested in.
Typically, it iwas released just before Shadowlands launched, and so is now out of date in respect of the order of expansions you level in, and the level numbers themselves, since Shadowlands changed that, but it is still accurate about everything else, so may be quite informative for you.
Websites you should bookmark:
wowhead.com - is your first stop for any information about quests, where to find things, items, maps, achievements, dungeons and raids.
icy-veins.com - keeps a basic instruction guide for your class and spec - how to play it and what stats are best. Since you get more abilities as you level, its instructions will list abilities you don’t have yet, but by the time you are 20 or so, you should be able to cobble something together from its instructions.
Wowpedia https://wowpedia.fandom.com/wiki/Wowpedia is an encyclopedia of all the characters and events and items in the game, approaching mostly from the story side than the game-playing side. If you want to learn about Genn Greymane or Jaina Proudmoore’s backstories, it’s the place to go.
If it’s in WoW, it’s on YouTube somewhere! Nobbel’s channel https://www.youtube.com/user/Nobbel87 contains videos telling the various stories (Lore) of Warcraft. Other channels specialise in various types of gameplay, different classes, PvE and PvP. Go to YT, type in the name of any quest you are on, and you will find videos of people completing it! Just be aware of the date of the video you are looking at, so as not to be confused by information that is relevant to older expansions rather than this one.
And especially, if you have any specific questions, PLEASE ask here! You WILL get an answer.