bitcoin scaling solution need feedback

[allaboutcrypto]

I have this idea for bitcoin scaling instead of larger blocks or the lightning network how about we institute side chains and instead of having miners mine transactions on these side chains we have the two parties mine it and if there are any problems the side chain could be added to the main blockchain and the benefit of this over lightning is there could be no fees besides  when it has to be added to main blockchain

[Nubitcoinerr]

How are we going to institute "side chains"