I would like to set up a randomized controlled daily diary intervention study. There is an initial survey (the same for all) and then they should be randomized to either getting the experimental or control intervention each day over two weeks starting the NEXT day (not in the initial survey). There will also be a post- and follow-up survey for everyone after the intervention period, plus a daily survey.

That means, everyone will receive the same questions, just different interventions each day.

• How and where do I set up the randomizer for the interventions? 

• And how can I make sure that every participant receives the correct intervention each day according to their group?
• How can I make sure that everybody receives all surveys?

Would appreciate any help and step by step instructions, thank you very much!