Get out of the Ki84 and into a Spitfire, get behind him line him up in your sights and shoot.
Seriously if you are a complete noob to dogfighting, start here:
http://combat-asylum.com/uploads/dow...ogfighting.pdf
Then read this:
http://forums.ubi.com/eve/forums/a/t...3/m/9121094645
Then this:
http://simhq.com/forum/ubbthreads.ph...29#Post2163129
And if you want to get serious about increasing your flying and dogfighting skills sign up here for a course:
http://www.joint-ops.com/php2/index....=98&Itemid=121