first, good job on paying go pro's. i have a few hero's (the hd one) I'm one of the owners of pro audio visual inc.
but what you are trying to do is very easy in todays world. first thing is cam and computer. which u said you have both.
next is internet. a lot of ways to get it. and u don't need much..... a lot of people stream at 500-800 kbps. on anything with 4g LTE you should be great. but on 3g.... its going to be 50-50. (how far you are from tower, how many people are using that tower, weather, man... a lot of things) but that docent mean u cant lower the stream to 300 or 200kbps. (also think about calling the track you are going to and see if they have wifi)
after you think you got that down. you need an host. a host is needed to let everyone see it at ones as your internet cant push it out 100 times. (or whatever number of viewers you have) with that there is a million of host sites. just google web streaming and find the one you like. few things to look at when picking your hosting site...... money (how much), then how many viewers can you have at 1 time, what kbps (high = better video stream), and the biggest thing to look at now days is if that host has h.264. (thats all you ipod, ipad, iphone, and safari as ALL mac's that ship now don't have flash)
if you really need help please email me at firstname.lastname@example.org
lol, free to talk :) you have helped me a few times
oooo hell, if any one needs help let me know.