Marketing Phrases

Hi,

I'm new here, but this site looks helpful and friendly. I'm working on translating some of our marketing materials from English to Spanish. There are a few phrases that I'm stuck on. For starters, I need help translating

1) Next Day Delivery

2) 30-day money back guarantee

I can translate the words verbatum, but I'm not looking for that. I'm looking for the Spanish equivalent phrase for it, or how it is spoken commonly. Any help would be appreciated. Thanks!

entrega al dia siguiente
garantia de devolución de dinero en 30 dias.

Thanks, Sandra T. :)