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Best thing is to build buisness on line based on your expert or habit.
If you are expert in some thing & you can put online to sell for people such counsultancy services in your area of expert. May be you have a habit that you can learn it to people.
Also broking or work as a broker is something very quick start up business & doesn't need to invest money if you only will be a broker. Only you need is to know the sources & the market to distribute.
1st you can use free social media to test your service |7 get feedback then you can move to build your own website/platform.
you can start website for marketing and advertisement. and to attract crowd to the website you can post things which are in current trend. specially what people of20-40 age range like. such investments pay off really well if you have proper plan and ideas to attract people. you can take an example of google and facebook. they are much bigger than their founders ever imagined it would be.