[sqardius]

Hi,

I'm not an expert in the field ( yet ), but from my own point of view and experience,

1- To start developing in android, if you don't know Java, you should first learn Java (it's not obligatory but highly recommended), if you are willing to learn Java and if you can understand French, I recommend SiteDuZero.com, it's really helpful as they start from scratch, and by the way there are lot of courses about almost everything.

2- I've always used Eclipse, I don't know if it's the best, but I've never had the need to look for something else.

3- No one can answer this question, it's up to you to know your strengths and weaknesses, but I think that for example: 4 hours in a row is better than 2 hours in 2 days.

And good luck.