1. No there isn’t, but ensure you have sufficient savings amount. If you’re employed, put employed but be prepared to provide same proof as workcation too; payslips etc.
2. Departure date can be any date, but yes advise within 180 days.
3. Yes correct.
4. No, be honest -
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they can see previous applications anyway.
5. depends on where you are applying from (if home country, use utility bill; if other country, can be visa entry stamp in passport, or hotel/airbnb confirmation)
6. A Spanish bank statement is fine, but if it’s in Spanish, translate it online, to English- people have been successful doing this method online.
7. it can be from the gyms which offer directly DTV support - be sure to use one who has proven approval rates to avoid refusals and loss of application fee. One i can remember off the top of my head, is Muay Thai Fever Gym - though this is located in Chiang Mai.
Please try to do some research into the group, I have answered every question of yours, but all the answers to your questions will already be in the group answered previously too.
Good luck.