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My friend had made an EOS contract and he has asked me to submit a random uint64, I need to generate this in nodejs.

Do I need to use a library like big number https://www.npmjs.com/package/big-number or or int64 https://github.com/broofa/node-int64 Ive read the docs and i just don't get it?

Do I then need to convert the number to hex before I send it to the contract?

Is there some library that will just give me a random uint64 ready to fire of to an EOS contract?

Would something like this do the job?

var crypto = require('crypto'),
biguint = require('biguint-format')

const myUint64 = biguint(crypto.randomBytes(64), 'hex', { prefix: '0x' }); 

// myUint64 = 0x748eba3cfdc84c0d9ecd86a4878c7291649abee4c93417226af3ed2f31ec6e81c4ebafc770f77eb9aefec1662fc7fbb70e4b855589ef976d1ff88b88652a2262
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There are different ways to generate a random uint64/ulong in Javascript like concatenating/multiplying the results of Math.Random() or Math.Floor() or using third-party-libs. But here's not really the right place to ask for these things as it's not directly eos-related.

You need to serialize and sign the whole transaction before you push it through chain to the smart contract. You should take a look at eosjs https://github.com/EOSIO/eosjs and probably look for some tutorials on how to use eosjs as it does all this for you.

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