There is a lot of good advice here already. I don't know if you know, but you can only find 1 colour of each item in the store. You can get other colours from villagers, from shaking trees, from Wisp and from Redd whenever you unlock him. Also by trading with others of course.
If you have any controllers with turbo buttons, they are really good for shaking trees, hitting rocks, wishing on stars during meteor showers, etc. If you only have joycons, I would suggest looking at alternatives early. The drift seems exceptionally bad in AC
Do not compare your island to the island of others. You are making your island for yourself. It's not bad to take inspiration from others, but it is possible to get too caught up into it.
You can only get 4 fruits from your own island as far as I know. 1 native fruit, 1 sister fruit, the fruit you get from your mother and coconuts. For the other 2 you will have to trade. I don't know if you can get them in any other way
Gold ore is really rare. I really recommend not selling any. They are used to make various items including gold tools. Gold tools also break, so it is generally not worth making them
Go to the terminal every day in the resident services for some free nook miles. You don't have to keep doing that if you have a lot of them, but it is good to do in the beginning. When you unlock nook miles + tasks, try to do at least the ones that give extra nook miles as well. Nook miles can be used to get tickets to find villagers on islands, and they can also be used for some exclusive items.
This is more of a personal opinion, but I don't think it is a good idea to get too deep into the stalk market. You can get millions of bells easily that way, but I think that takes the fun out of the game. If you wanna do turnips, try to stick to your own island, or only buy a limited amount, so you don't suddenly end up with so much bells you don't know what to do with.
I can't think of much more, but I hope this was helpful
