Generally speaking, the only valuable "toys" from china are actually merch sold in the pokemon centers that is made in China.
IE) Takara Tomy Figures -> If you have say an Electrode or Voltorb they sell upwards from $50+
My advice:
1. There is no get rich quick way. You need to invest, trying to "outsmart" people buy "buying bulk" will not work. If everyone did that and bought 1000 cards for like $10 and sold them for $1 each, ebay would just be full of garbage. It would be a waste of time + money doing that.
2. Stay AWAY from youtube. I cannot stress this enough! People like JWittz and PrimeTimePokemon already have a HUGE sub base. If there is even a hint of a raffle, instantly their videos have TONS of views. If someone smaller has a raffle ex: You. You have 135 subscribers and you haven't made videos in 2 years, I'm sure a lot of them are out of their pokemon phase.
3. You need to learn the ups and downs of pokemon. It is like Civarc said, a stock market. I selling a ton of Yanmega Prime for $5 a piece, and the next week that buyer resold for $45 each because I didn't realize that they were going to be playable.
4. You want to build a relationship with other community members and communities. I belong to 3 wholeheartedly, and another handful casually. I recall you joining another community I'm a part of, and then you were blatantly trying to get the bare minimum for selling permission (by repeatedly posting). Relax and stay awhile, you'll see as you make friends you will be able to have more connections.
5. Sell anything playable you think will be collectible in the future. It probably won't, as soon as rotation comes in a year, they will be worth a lot less. IE I recall you asking about Regigigas EX FA and Mewtwo EX FA. You missed prime time to sell them... They are slowly on the decline.
I'm sorry if I sound rude in any way, I'm just trying to help you and be realistic.
I wish you luck "expanding your collection" but personally, since I haven't seen anything from your collection, why would I help? I'm sure many people are the same way. We've heard "My collection is HUGE" and then never have seen a small snippet of it.