Right now l am on a longboard, and l wanna switch to a shortboard, is it gonna be hard? Right now l am on a 9'6 and a 10'0, and l wanna switch to a 7'8 or something. Also l am thinking about getting a sponsor, so do they give sponsors to longboarders? Thanks so much. =]

try a fish, it is a longboard in a short board size. it has thick rails and its wide. so it is great learning to get used to short board size
and once you start to get good it is also GREAT for learning how to turn like a shortboard because it is SOO loose.
it also teaches you good smooth turns short board turns

l almost agree with Colton (above), but suggest u go with a hybrid fish in the 7'0'' to 7'6'' range. Look for wide (20'' or even a little more) & about 2.5 inches thick. It is a 'step-down' board & will help u transition to an actual shortboard. l do not recommend just going straight to something 6'0'' - 6'6'' in length - too much adjustment to paddling, timing & riding. If you're determined to get down to a real shortboard, then buy the hybrid used, surf it for a few months & then take the next step (you should not lose any money buying used & then reselling it provided u do not ding it up).

if you cant ride a shortboard yet, and l mean a shortboard(under 6' 6'') it is doubtful you are good enough to get sponsored for longboarding, even longboarders can ride shortboards