Online registration form: income tax

My partner and I have just moved to France and are both going to register on-line for the Auto Entrepreneur scheme. Our French is limited so wondered if you might be able to give some advise on a few sections of the form. Both myself and my partner will be providing services to a UK company. The work we’ll be performing will be general office admin (computer-based), customer support by email, and IT support/assistance. Al work will be performed remotely via email / internet from our home in France. On the registration form:

1. Should we choose Activités Libérales at the top - is that correct for our type of work? Then should we choose Profession libérale rattachée à la CIPAV pour le régime vieillesse the 1st option?
2. In Section 6, where we list our activities, do we have to put something from the CIPAV list, such as Conseil en informatique, Ingénieur informatique, Conseil technique, Secrétaire à domicile (or could you recommend better ones)? Or do we just write a description of what we’ll be doing? What would you recommend?
3. In section 8, Option pour le versement libératoire de l’impôt sur le revenu calculé sur le chiffre d’affaires ou les recettes? Could you explain what this option means - should we tick yes or no? We want to be on the system where we declare and pay online every 3 months, based on our actual turnover.