Jetblue, from most airports, has selfserve kiosks. You can plug in a credit card or your confirmation number. It will bring up your itinerary. Then, it will print out boarding passes for each person. You will then be directed to the Jetblue counter to get your bags checked. They will ask for ID there, they will tag your bag(s) and you will head to sercurity. There, you will show your ID and boarding pass to the TSA agent. You will take off your shoes, any overcoats, empty your pockets, put all that stuff in a bin, put your carryon bag up on the counter and off it all goes, through the scanner. You will have your ID and your boarding pass in hand as you go through the people scanner. Collect your belongings at the end of the conveyor belt.
Be sure to have no liquids or gels larger than 3.4oz in your carryon. Check out the TSA website for instructions as to what you can, and can't bring, through security with you.