Your idea is very good but $ 200 is very little you could use something over $ 1000. and obviously you should know what you are doing because it is not only to start trading, you have to have notions of what is being done but you will have big losses. learn first then invest
Its actually hard to make 10% profit daily especially at the current market situation, also the capital is too small for this. Its better to buy good coins then hold on it. Its really hard to do day trading if you are limited in ideas, so learning more is one way of making good profit.