Primary school teacher, air hostess or health care assistant?

What's the best salary? What's the most competitive? If I was a health care assistant it would be in a nursing home. I have a place at university to study primary school teaching in September. My plan A is to be an actress, so I'm going to get an agency and want one of these careers to fall back on, which one would be most suitable? I have 6 GCSEs including English and maths and Level 3 BTEC National Diploma Health and Social Care and A Levels English Language and Drama and Theatre Studies. I have no qualifications in travel and tourism and no customer service experience, and I can only speak a little bit of French. Would working in a nursing home count as customer service experience?