Hello.
I have experience with cryptocurrencies. In order to make a Bitcoin fork, we would need to define several details like the block size, the difficulty, Name and symbol, total supply, etc.
With these simple details, you can get a copy of BTC for your own purposes.
Also, you could introduce some more advanced changes like the consensus method, signing cryptosystem, hashing method, among other factors.
Please let me know what do you have in mind, I'm sure we can get a very interesting collaboration here.
Looking forward to hearing from you soon,
José Contreras