1. No I have not had any wind training before
2. I think wind is a source of destruction and defense at the same time. Destruction meaning to completely destroy land and its surrounding and defense like repelling attacks or literally acting like a barrier. Wind is very weak against fire for fire is fuel by air and so fire attacks become stronger.
How ever, since wind is a natural lightning insulator, wind is powerful against lightning attacks. Once I learn lightning nature, I would first send a wind attack, than follow it by a lightning attack in order to fuel the wind therefor making a more powerful attack.
3.wind is made from sucking in air than letting it out or moving an object like a fan or instance back and forth to make a gust of wind.
4. I want wind because not only is Asuma specialize in wind chakra, but I have always found wind style jutsus breath taking.
5.
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