General questions about car speakers & Hello

Hello first of all, this is my first post in your huge forum. I like it here now. First of all: I am a Newbie in the field. I own a Golf II CL (my first car) and have a Medion P62000 radio with 4 x 22 Watt RMS and would like to install new speakers now, since the current original front boxes do not bring any bass at all. I don’t want to build a bass miracle now, where my ears fly away (but also the financial means are missing), but a little bangs should it already have Since I don’t have a great idea of the technology, the following questions now arise: 1. Is it worth buying loudspeakers with more than 22 watts of RMS power if the radio does not output more power? 2. Is 22 watts actually a good power? 3. The radio has 4 channels. Can I also connect a subwoofer? Or do I need an amplifier? Where is it connected? 4. I have seen, there are also so-called bass boxes. Bring the what? 5. Bringen di e normal frontboxes also bass? 6. Which connection technology do I have to use? Coaxial or something else? Thanks for your help and another nice day. Many greetings Flea PS: I am a trained computer scientist (FISI) and if someone has a question in the field, I am also happy to help