Well I can only answer regarding question 2, and 3

1] How long does it take on blue card?

 - Well in general they say it can take upto 12 weeks but I have seen lot of cases where it easily takes 5 -6 months as well (and few got inside 2 months). So, with German immigration there is no time limit (Know from personal experience)

- If you have just joined your job 2 months back then I assume you would be in probation for 6 months (as per German standards) and here is the problem. In general ABH waits till your probation gets completed (happened to me) and asks for the confirmation letter from your employer that your probation has completed and that now you are confirmed employee of their company. But there are few cases where spouse visa for Germany was granted to people inspite being under probation. So, it really depends but MOSTLY ABH in Germany waits till a person is out of probation and I know it could get very frustating as it could easily add 4 - 5 months of delay.

I suggest research on trust7 for topics on "spouse visa under probation" and you will get a clear idea of what I am talking about.

Hope this helps!!!

All the best