Starting with 100$ doesn't matter and in fact, I started only with 50$ when I am starting in trading although I lost it all because I am just a newbie at that time. If you want to start trading. Maybe these can things can help you.

1. Read, Watch and Learn - Do these 3 because in order for you to be a successful trader, you must be a learner all the time. The one who doesn't want to read or learn and they just trade with no knowledge are the ones who lose their money. Make sure you are learner and you will succeed.

2. Have a mentor that will lead you all the way - If you want to be a successful one, you must have one mentor that will guide to you because if you do it yourself, there is a chance that you don't know what you are doing. Sometimes doing it alone makes you overwhelm and in the end, you will not do trading anymore. Having a mentor is the best way if you want to start trading.