well, if you were planning on slow building, you kind of screwed up... especially with training stamina. i would personally recommend a retire/re-roll, but if you want to keep him, speed to 68 cap.
for future reference, this is how to slowbuild:
there are two ways- A. Cap Build, and B. Training Focused
A. train attribute until attribute+SPs=48. continue placing SPs in 48 capped attribute until it gets to where you want it to be (often times 68) while training attribute #2. when attribute 1 is 68 capped, place SPs in attribute #2, rise and repeat.
B. train until it is no longer feasible to train the attribute (SP wise, i believe it is 33, where it becomes less worth while.), and then pour SPs into capped attribute. move onto another attribute, rinse and repeat.
option A focuses on getting the most out of natural gains, as they are worth more the higher the attribute is.
option B focuses on the great training %s you get when an attribute is fairly low.
for a corner, your main attributes are speed, agility, and vision. after those, probably jumping and strength, so work on those first. stamina is usually one of the later things you touch, probably training it with confidence.