Select some decent specifications. Also decide whether you want a single stage or multiple stages. Multiple stages would need some compensation and can get more difficult.
Perhaps...
60dB Gain,
10MHz Bandwidth,
ICMR of about 50% of your supply voltage, the actual numbers would depend on whether your amp is NMOS input or PMOS input.
OCMR of about 30% of your supply voltage.
A basic 5 transistor differential amplifier would be able to meet these specifications.
Start from there and then you can try tweaking the circuit to squeeze out more performance.