I think that with 1-2 page, it's hard to explain and guide designing opamp . You should refer to CMOS analog circuit design book (author: Allen, Holberg). They wrote in detail and step by step to design the 2 stage opamp. If you don't have much time, let focus on the chapter 5,6,7 in that book.
Good luck!
One possibility:
For the first stage, consider using a folded cascode topology (with PMOS inputs) to get high gain with good voltage headroom. For the second stage, use a topology for low output impedance and good swing - eg a common-source stage with active load.
You may want to consult a good analog IC design book (such as Razavi's) which will provide more detail.