Hey,
I have to admit that wossen is probably right. Teaching in Sachsen-Anhalt with non-perfect German does not sound very attractive to me. But maybe it is possible with a good sense of humour. You'll find anwers to almost all of your questions here:
https://landesschulamt.sachsen…lgewinnung/seiteneinstieg .
People leave the Seiteneinstieg regularly again, because they are overwhelmed or frustrated, but it seems rather unlikely that Sachsen-Anhalt would fire you if the quality of your work was fine. They prefer people to work full-time, but there a part-time options. The payscale is mentioned in the document I linked, and if you put "TV-L E11" or whichever one applies to you (E9b till E12 are options) into google, you'll see into how many Euros that translates. Good luck with your decision°