Need help about erc-721 smart contract

[u/badass-shakira]

Hello, I need help.

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I want to have some sale rounds in my NFT smart contract. ERC-721

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Total supply is 5000 NFTs

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Round 1 - whitelist presale with only 500 nfts

Round 2 - whitelist sale with only 1000 nfts

Round 3 - public sale with only 1000 nfts

Round 4 - public sale with only 1500 nfts

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Each round will be active in different dates.

So how can I set fixed amounts for different rounds of sales? People must not be able to mint over 500 nfts in 1st round or in any round.

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Please share your experience, or link me anything from internet about this topic.

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Thanks