If you want to immigrate as a skilled worker and would like to work in Canada, then you need to appear for IELTS - General module. Academic module is meant for those interested in enrolling for a course like MS or MBA in Canada.
To obtain a good score above 400 CRS points, you need to achieve CLB 9 equivalent scores in IELTS i.e L-8,R-7,W-7,S-7
If you obtain the above minimum scores, then you would be able to achieve a good score above 400 CRS points.
Your spouse can also apply for ECA and appear for IELTS, so that you obtain points for your spouse as well.