Having a 9-6 job is not the most rewarding venture in life but if you acquire the right skills and experience on a job over time, it is productive to consider making money by the side with your skills and creativity.  Every skill is marketable and bringing value to the table will make you more money than you can think of. Your personal skill and passion is the best business idea and opportunity you can think of. Channel your strength and monetise your skill. You can never run out of business this way. Here are some ways to make money with your skill.
BLOGGING: Writing and having good content about what you do or enjoy doing is a way to make money within your niche. It might take a while before you start to make so much and getting audience practically doesn’t happen overnight. This is why you should blog around your niche. This would make content development easy for you and build you up with time. You would be surprised how much people make from blogging and demystifying information.

FREELANCING: While working and getting paid on a regular job, nothing stops you from being a freelancer for other companies that requires your skills. This is considerable for writers, web designers, e-marketing etc. so many people are willing to pay so much for the skills you possess.

PRODUCTS FOR SALE: This is another way to make money easily by applying your skills. Make products of value that would help people solve their problems in a way or two and you would be surprised how much money you can make if you do it right.
ONLINE AND OFFLINE TRAININGS: when you have a skill that people are always looking out to acquire. One of the ways of making money easily is by organising seminars and trainings for people interested. You would be surprised how much people will be willing to pay to acquire the knowledge of a skill you possess. This is another easy way to monetize your skill and be financially independent.

CONSULTANCY: when you become a pro at something you do, you will discover that the experience you have gathered over the years can channel you into successfully becoming a consultant in your area of specialization. You could make money by making yourself available to give people guidelines on how to excel in their field and the right ways to go about achieving their goals. This is sure going to put some money in your pocket also.
If you can get creative and think outside of the box, there are so many reasonable ways in which your skills can make you money either full time or as a side business. This is an avenue for being self employed and making good money.