In the process of giving my scoot a bit of a touch up - not a full paint job- doing myself using rattle cans,and its going alright so far,wont win any custom shows,but its OK.Anyway I've got SX panels and want to do them two tone,green on the top and white where the flashes go .like the picture (not my panels googled for the image)

so that where in the photo its red my will be green,right to the questions.
1) do the white first?
2) Is there a brand of masking tape thats best so that it wont bleed between the 2 colours,or just the every day stuff from B&Q do
Any tips or advice would be great
I am playing all the right notes, but not necessarily in the right order.