$500 amount is enough to start small trading in bitcoin and altcoins. But because you want to invest in ICO you need to be careful enough in choosing good ICO because there are so many ICO's out there that is good to join in the beginning but at the end it is scam. To select a good ICO you need to learn their project,the purpose of their projects,read the whitepaper, know the persons behind the project so that you can say that the ICO you choose is legitimate and you are become lucky to invest in their project. I have a suggestion,just try to read and learn the ICO in my signature The Organicco,for my knowledge and research organicco is one of the good ICO that the purpose of their project is to develop a green technology for the future of our planet.You can learn more here...https://organicco.uk/. But you need to do your own research so that you can't blame anyone because you know investing in crypto or ICO are very risky.