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Nosotros gustamos comprar cosas de el mercado. (2 errores)
NOS GUSTA comprar cosas DEL mercado.
In spanish we don´t like, it is IT LIKES US... so we don´t use nosotros, or yo, or tu or anything that shows us we are the subject (the one doing the action). In spanish people receive the like from the thing which is why it goes with the indirect object pronoun (me, te, nos, os, le, les). This happens in all tenses:
Nos gustaba siempre comer helado en el verano. (we always like to eat icecream in the summer)
Les gustaría viajar a hawai´i. (they would like to travel to hawai´i)
DE with EL after it = DEL
DE with LA after it = de la (not del la)