Hi there
While enthusiasm is to be admired, there is too much too soon - as you seem to've found out.
Mostly what you've got there should sort itself out over 2-3 days. It will still be bruised etc, so you'll then take a week+ off; your cock simply isn't conditioned to high pressure, long period pumping. During this time, go re-read some of the "starting pumping" posts and threads and now they'll make much more sense... you just need to build your cock's pumping condition and achieve results you want (including the pumper's colours
But right now.... Rest it, recover, read, then resume.
(If conditions persist beyond the next couple of days, it may be with considering 'that trip' to the doctor's. What do others think?)