There will be a new season soon enough, but we dont know yet when that is. I would recommend you still start and get some of the nice booster items you can already get this season. It will also allow you to get some additional rewards at the end of the season which will be very useful for your future gameplay. Just see this season end as a testing ground for the game / mechanics / classes. And start going for actual growth / progress with the next season.

I agree entirely with Minarya. Sometimes season gets extended by an additional week so you never know if you'll get bonus time to play with your season character. Although I wouldn't expect this, it can happen. At the very least you can collect as many seasonal rewards as you can such as Perillas Star (or any other reward of your choice from the list). I would not recommend spending all of your time doing everything as fast as you can since you might encounter a burn-out.

A veteran player can complete everything in season within about two or three days time. Since this is your first character this is not possible but you can still earn many benefits from participating at the very least. If you don't like your character you can always delete it but please be sure to move all your items in storage before hand. Finally, you may wish to visit garmoth.com and paste all of the coupons found on that site in-game (Main Menu -> Support -> Coupons) and don't forget to pre-register for the upcoming Wusa class for more freebies! Click here to pre-register.

There is a lot to learn in this game, take your time and just have fun. There will always be another season :)

For a season guide you may refer to Black Desert Foundry's Season Guide here. 

Have fun!

Thank you very much for your very qualitative answers. I will continue my adventure quietly to discover the different possibilities offered by this mmo. Having bought the editor collection, I will find out so that I can recover the different objects with my future character who will become my main character and with whom I could do a full season. Thank you again for your answers, good game to you :)