Actually, you should comply with several rules in the process of choosing a broker I guess. It's kinda difficult and the main difficulty is to dedicate uncertain amount of time to the procces of choosing a suitable broker. Some traders don't want to do it and pick the very first broker they've found out. To my mind, it's very important to choose a proper broker, because brokr is a direc treflection of traders' success. If you have unproper broker, then you probably have much more chances to lose all your accumulations, that's how the psychology works. If you see that broker isn't interested in your success, then it's very sad for you.
There are several things that I would check for. At first glance, I wouldn't consider a broker that doesn't have a transparent website that lists their costs, spreads, the minimum to open an account, deposit and withdrawal methods, and so on. If those things are missing, it's usually a sign that the broker has high costs and unfavorable terms. Easy to reach support is another. Personally like to see LiveChat available as it seems like brokers that only respond via email take way too long to reply.