Moving to Germany on a visit visa

Au pair jobs are best arranged from your home country since you would have to go back to do the visa anyway. But being an au pair is NOT a career. It is only allowed for young people and limited to a year. The main thing is to learn German while here and you get a small amount of pocket money and accommodation for your work. It is NOT a normal job or way to earn serious money or lead a normal life. The rules for au pairs has been discussed at length on other threads on this site. It sounds like you are making unrealistic plans without having a clue about the rules. And unless you are well educated and have demanded skills you are not likely to get a job visa – and without one you will not be able to work. Sounds like a good way to waste your effort and get sent right back home.