If you want to become an investor and buy companies for low and sell high then you came to the right place. You can start investing in businesses with any amount of money when starting out. If you want to become an actual accredited investor then you will need to have at least $100,000 is disposable income. If you are just starting out you can invest in smaller businesses using several online partners that allow you to invest without being accredited. If you need some ideas as to the type of businesses you should invest in then I would recommend looking at some of the different topics and areas that you find interesting. If you are into sports then it would make sense to look for businesses in need of capital that are sports related.
If you have some money to play with then I would start doing some research on businesses on site such as crunchbase.com. Another great site would be wefunder.com which helps find businesses that are in need of capital.
The most crucial step you must do is researching the businesses. It may be easy to want to invest in a business because they are an area that you find interesting but it has to make dollars and cents in order for you to invest and make an ROI.