IGNOU is one of the most economical institutes in India to get a degree by distance mode. It also has many satellite centers from where you can pursue you studies and weekend sessions. Since you mention about your financial hardships, you need to be focused and prepared to concentrate on studies while you work.
Your choice of B.com would be fine.Before you jump in please consider
1.Your desire or choice of career. DO you have any course realted to that from IGNOU that would help you acheive your dreams
2. Your current Job, is it a stand alone job, what the growth prospectus for you in that company and hence what education qualifications would enable you to move up the ladder.
3.If the current firm has not much potential to grow, then narrow down the area of your work expereince which you would be showing on your CV and then narrow down on the course that your help you.
For instance, if you are a customer care staff or a cash officer in a firm, then plan for your B.Com with focus on finance or IT skills and move up.
If you have good leadership qualities and have a small team under you or you are good at human resources, then focus on a MBA after your B.Com
So, your decision to do your graduation at IGNOU is good, please give a thought about your current job experience and choose a degree that is relevant to it so that you have a better chance of getting a promotion in the same company or apply suitably for a higher post in the same sector at other places.