Do these sentences work for andar?

They hit all the hot spots when they are in Memphis.
Ellas andan todos los clubs nocturnes cuando están en Memphis.

I believe that my friend is around here somewhere.
Yo creo que mi amiga anda por aqui.

The children went round door to door last night sellling cookies on behalf of their school.
Los niños anduvieron de puerta a puerta anoche vendiendo galletas por su escuela. Can gerund stand alone?
Anoche, los niños anduvieron vendiendo galletas de puerta a puerta por su escuela. Preterite & gerund okay together?

Do these sentences work for andar?

They hit all the hot spots when they are in Memphis.
Ellas andan en todos los clubs nocturnos cuando están en Memphis.


I believe that my friend is around here somewhere.
Yo creo que mi amiga anda por aqui. It's accurate.

The children went round door to door last night sellling cookies on behalf of their school.
Los niños fueron de puerta en puerta anoche vendiendo galletas para su escuela. Can gerund stand alone?
Anoche, los niños anduvieron vendiendo galletas de puerta en puerta para su escuela. Preterite & gerund okay together?

Yes, your sentences was almost correct.

Just one TINY mistake, Crotalito!
Yes, your sentences were almost correct.
Good job!