Hello,
I have done lots of MIPS projects here on this site using MARS simulator. Please check my project history.
I see that for your tasks you have to use a customized version of MARS with "reduced instruction set".
So this will not be an ordinary MIPS project and it would be helpful if you can provide as much additional information as possible - examples, notes, etc.
I will be travelling the next 3 hours and I will not be online.