How to buy soccer shoes

I bought shoes to both feet, would like to ask this, the selection of soccer shoes need to pay attention to what.

1. what brand of shoes more suitable for Asians in the foot type (I Jiaobanshaokuan)
2. should choose what material shoes (like what kangaroo skin, leather and PU material it)
3. the purchase of channels (store the better which benefits)
4. Spike (General I kicked artificial turf, still quite the formation of) the choice - FG? HG?
5. shoes code size, whichever is what ? (With the thickness of the socks?)
6. details of the selection (the selection is the time to observe the physical details of those few, can distinguish between pros and cons)
7. insoles ----- In addition, I see Taobao posted on the shoes of the picture, see above some of the insoles out also shot pictures, this is what truth . Insoles also distinguish between good or bad?