NFT Project With Direct Integration with Opensea

We need an NFT project which has a front end website for marketing, and has a contract that mints a fixed number of NFTs (we provide the design of NFTs), all these NFTs are unique and have unique features and traits which define their rarity. These NFTs are minted once all at once and a presale is executed and the buyers recieve these NFTs in their ETH Wallet. The cost of each NFT is predefined and sold via pre-sale. And on opensea these NFTs are opened in a timely manner and users can then trade these NFTs on opensea. All the min price of each NFT goes to the dev wallet and each NFT transaction has a royalty associalted (this functionality is predefined once we integrate our contract with opensea).

Reference Projects:
1. https://www.collectvox.com/
2. https://www.sadfrogsdistrict.com/