It is said that if there is a will there is a way. It is very much feasible and possible to work as well as to study at the same time and millions of poor and lower-class students are doing it across the globe and some of them would definitely be able to carve out a very successful career in due course of time and I am pretty sure of that due to my own experience in this matter. I myself am from a lower-class family and during my student life did many jobs to earn pocket money for myself and I will like to give a brief of that before I come to address your query in details. Some of these jobs were like to teach students of class 1 to 5, to make paper envelopes from old magazine and newspapers which were much in demand at that time as polythene bags were not introduced in a big way, to work part-time for 3-4 hours in the evening time in a shop which gave very little remuneration, and other such petty jobs etc. I am just mentioning this as a matter of encouragement and do not have a wish that you should go for such insignificant jobs.
As you have already done your graduation, you can now very well search for a full-time job in the industry pertaining to your core area and for that you have to keep a watch on job portals and newspapers and once you get a position then you have to apply for a correspondence course in any reputed distance education university in the stream of cost and management accounting. When you are in a job, it is natural that employer will have some expectations from you and you have to fulfil them in the best of your capacity to survive in the industry and at the same time yo will have to give a god time for your studies. The correspondence mode well suits to the employed persons as it has many options and flexibility regarding the time which a student has to spend but at the end of the day what matters is only the hard work and focus in achieving one's academic aspirations.
As regards the job hunting you might try to get a job related to areas like Banking, Budget planning, Teaching, Material management, Inventory control, Accounting, Tax planning, Human resource management etc. These are only indicative and there could be more depending upon your interest and liking.
For acquiring Higher education in cost and management accounting there are some good correspondence institutes like IGNOU, Amity University, Xavier Institute of Business, MIT Pune, Symbiosis, NMIMS etc.
Knowledge is power.