EVM Opcode design

To instantiate an op-code that can be compiled into the proper EVM language structure. I'Have this equation x + y^2 = N as the Solidity language equivalent of "linearFunction" that takes 2 inputs x + y and returns N. Need to figure out the EVM opcodes that would create this equation, and it needs to be added to the top end (remix) guys add it to type checking et al on the top end of the stack. Next would be to create own op-code (in communication with the protocol team) that allows us to use a non-standard EVM opcode (0xe1 for example), and use the same compilation mechanism that we have worked out, and output that op-code within the compiled EVM so that the protocol team can implement it. I need someone to help me do the above and train me on the general concepts associated with the tasks