What are you good at? Are you academic or sporty? Arty or intellectual? Choose the skill or subject you are best at and most enjoy. Your business start up idea- to share your knowledge or talent with others. To succeed at this you need to be a people person, great at communication and able to share your enthusiasm with others.
Types of business include:
Tutoring- This may be academic or musical, charging per lesson or for a course. You can be at any level, but should have some form of qualification. Just target those at the level beneath you, so if you have a masters tutor graduates, if you are in your final year teach first years. You will have a lot of valuable experience. Make sure you are up to date with current teaching in your subject and any syllabus requirements. Create a great range of professional and easy to use teaching materials that you can use in your sessions and give to clients. Chart their progress so they can see how your service is benefiting them. If working with children you may need a criminal records check. Share your academic achievements with potential clients.
Consultant-Fashion Stylist/Interior Design etc- Have people ever commented on your impeccable style? Use this to advise others. Attract customers by creating an attractive and interesting portfolio. Make it professional and get clients to write you references. Nothing to go in your portfolio? Redecorate your house or someone in your family. Restyle a couple of friends! Make it fun, but try to stick to a theme or trends so potential customers can see if they like your style.
Artist- Share your artwork with the world! Sell it at local art fairs, online, approach shops, start a facebook page, hang it in local venues with promotional material, join an arts trail. There are plenty of ways to get your artwork seen. Be prepared for rejections artwork is highly individualistic, but if one shop knocks you back another will love your stuff. This is about volume, keep approaching people and you will get accepted. Create a style, let people know the story behind your work, and let them know if you will take commissions!