![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
Besides, I think you are confused with what is a wallet. A wallet is an interface to the Bitcoin network : it stores your addresses and private keys and uses them to craft transactions. Once you generated your key pairs yourself, you just need an (open source) wallet to interact with the Bitcoin network.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
For someone who don't understand the basics of how Bitcoin transactions work, why/how you need 1000 private keys at once? May be you think to create an online wallet (like blockchain.com) and find the way to funds of others (scam them). What are you trying to accomplish?