Discuss and learn French: French vocabulary, French grammar, French culture etc.
à première vue – at first sight
au début – at first, in the beginning
au premier abord – at first sight, initially
=> Yes these 4 are used.
the first two and the last one are used by educated too, but I think, by a bigger % of educated not just highly educated.
it's not a popular way to say that but everybody hears this commonly.
the third is used by everyone.