As a beginner, there are a few aspects that you should consider. Twin tip skis tend to have a shorter effective edge, meaning that the tail of the ski turns up earlier. That means that it will be easier to exit the turn, and you can roll into the next one without getting stuck railing the tail of the ski.
However, less edge also means less control on groomed runs, where you as a beginner will probably be spending the majority of your time for a while. Plus, you won’t be skiing backwards for quite a while, so twin tips are not necessary.
One exception to this is that if you’re a beginner skier, and you only want to ski park, you could start with twin tips. You will need twin tips in the park so you might as well start right away with them.