Drawing 3D geometry in Abaqus CAE/Command

Dear All,

I am going to draw a 3-D model to be run in Abaqus. I would like to know how I can do that.

I find it is a little bit cumplicated to design the 3-D structure with certain curvatures in CAE. 

Could anyone tell any assisting softwares or approaches of designing the 3-D geometry in a simpler way for finite element analysis?

Many thanks,

Jay