3d phonecase modelling on Onshape

I need an 3 D modelling of a phonecase for the oneplus 10 pro 5g phone with two types: one with kickstand and one without. It needs to be modelled on onshape. I need to see every step of the modelling so I can show it to my teacher, to proof that I did it. It is a school project, but I don't have enough time...