score:3
The airport shuttle (airport to central bus station) has low level racks where you can put big luggage. Sometimes if bus is full you’ll just have to stand with it. Your smaller luggage you’ll keep with you (no overhead racks).
To get to the bus, go straight out of the airport doors, through the crowd!, to the road. The bus stop serves several lines. There is an electronic departure board. Being spain, there is only a loose queue, or crowd, but you’ll get on.
The driver issues tickets. Last time I went it was 5€ Don’t offer a large note, you’ll end up clutching your change, your bags, and being shoved by the old lady behind who wants a seat!
You’ll know when you get to the bus station. Barrier for the bus, it parks. Ticket hall and exit straight ahead.
Ask more if needed. Have fun.