Shall we continue practising our pronunciation and speaking?

Yes, let’s.

I’ve googled a little bit about this subject and I’ve discovered to my astonishment that there are no video lessons about how to say a.

There are millions of lessons about when to choose a and an, which is also important. In case you’d like to practise with this, have a look at this article about a and some.

You can also do a few quizzes on the website about a and an and other fun stuff:

A, an, and –  (Beginner)

A and some (Beginner)

A and an (Intermediate)

A/An/The/- (Intermediate)

A/An/The (Intermediate)