Advice on selling my collection.

Hello!

I have a magic Collection (around $1500) and I want to sell it, I'm from Spain. What's the best way to do it?

I can open a premium account here in DeckBox if I could sell it, as a collection, not sepparated cards. I want to do it in one sale.

Is that possible? Is DeckBox the best option for that?  It would matter that the collection is located in Spain?

Thanks in advance for all the help.