B.Com

Very few courses are available that you can pursue along with B.Com as compared to those that can be done after completing it. Along with B.Com, professional courses like CA and CS can be done. Also, it would be great to learn computer skills like Advanced excel.

Yes, if you have a passion for company law, labour laws then you can easily pursue CS.
Make sure that your accounting knowledge is perfect and you'll pass. No, MBA degree is not required for CS.
CS is sufficient for a good career. Students usually do LLB with CS to have some extra advantages.

Can you please let me know which all subjects you had in commerce? Anyways, I would suggest you to opt for B.Com.

Of course, you may pursue these courses together and in-fact, if you belong to the commerce background, the Bachelor’s degree program must be pursued along with the company secretary course because it will save the time and preparation for one will help the other and especially the CS course will he

After B.Com, there are many options that you can look forward to. Some of them include M.Com, CA, ICWAI, MBA, etc.

Both are good options but government colleges will be more affordable and have a low fee as compared to private colleges and private colleges will offer better facilities as compared to government ones.