Work permit and Study Permit questions

1. + 2. After arrival in Germany (and moving into your place of residence), you need to register at the Einwohnermeldeamt/Bürgerbüro within 7 days. With that registration, visit the Ausländerbehörde for your residence permit. Then, with the residence permit, go to the Arbeitsamt to get your work permit. Your employer should be able to help you with this.
3. Ask at the university of your (her) choice for the entry requirements.
4. In many parts of Germany, there are long waiting lists for kindergarten places, so apply as early as possible! Schooling is compulsory from 6 years age onwards - you register your kids at the nearest public school or contact the local Jugendamt.

Thanks a lot.
I have one more question.
If I am applying for a Visa in my home country, is the German National Visa granted for 1 year initially? The application form has this clause and needs me to fill in the expected dates of entry and exit. So I should set it to be one year duration? And this can be extended from Germany?
Thanks in advance.

Just fill in your expected dates of entry and exit.
If you intend to stay longer than a year, or the date of exit is not yet known, ask the embassy whet to fill in.
The work permit can be extended if your employment continues.

Thank you very much:)