In lots of ways it sounds good.
How long is your warm up? Are you doing another warm wrap after jelqing?
Rather than starting off at good intensity, work into a good intensity.
The coloring and foreskin swelling is fairly normal. It can be reduced by pulling back the foreskin between strokes or jelqing one handed (dry). As long as you are recovered by the next day, all is good.
When you talk about numbness: are you putting excessive pressure on the top of the shaft and where do you finish your strokes. The dorsal nerve is located on top of the shaft in the middle under skin and fascia only (ie close to the surface) there is also a nerve bundle just before the glans.
Try to avoid excessive pressure to the top of the shaft in this area and definitely try to avoid hitting the nerve bundle by curtailing a stroke up to an inch before the glans. If on some strokes you can locate the webbing between thumb and index finger on the top of the shaft (above the nerve) its probably safer to do a full stroke to the glans.
Check out some of the anatomy diagrams around here. Once you understand how the penis is put together you will be able to make the most of exercises whilst avoiding injury.
Soreness is good pain is bad. Remember as you start to do these exercises your penis is fighting to repel the attack, within 2 months it will be a lot stronger with larger veins. You need to take it easy to start with (but not too easy :) ).