There are countless options out there and it is very easy for a beginner to feel overwhelmed. Which features should I be looking for? Which are the most important characteristics? How can the options be classified?
With little experience and without clear vision of requirements, this probably will not be the last synthesizer you ever buy. In other words, you are buying the exploration device.
For such a device, I would suggest to set the budget limit and select the synthesizer that has as many various features available as possible. Then you will be able to try all of them and be much more sure about your requirements later.
The quality probably does not matter as much, as after exploration (and discovering you really like) you can buy a long-term model that is strong in features you like the most.