Advice for learning spanish

Hello to all!

I would like to learn Spanish for multiples reasons but I am a total beginner...

Do you have any advice on how I could go about it, especially at the beginning? What order should I start in, or should I use a particular application, or watch videos rather than read books?

Also, I know a little bit of Portuguese and I have a better understanding than Spanish because my mother is Portuguese.

In the beginning, I wanted to learn both of the language but I think that Spanish will be more useful for what I need. But tbh I also really want to learn Portuguese to be closer to my origin.

Do you think I could learn both in the same time? or it's better to concentrate on 1 ?

In this case, I don't know which one I should choose (I am planning on going to a big trip to south america in 1-2y, that's also a reason to learn spanish).

I would really appreciate any advice and opinions you might have.

Thanks !!