Also, download the Mobile Passport Control (MPC) app from the TSA. Set it up before you go (create profiles for each person in your group, put in passport numbers, take photos of each person, etc.). Just as you land and get a cellular or wifi connection, start a new questionnaire, answer the questions, and submit your form. I did this while riding on the giant escalator mentioned above (don't recommend...it's dizzying!) There is a separate line for MPC, at the time I went through it was shorter than Global Entry line (your milage may vary).
Just after immigration is the recheck area for connecting travelers. Your bags should be tagged to LAX, so it's just a matter of handing it to the friendly folks there. I had a carry on bag only but stopped at recheck area because my bag was too big for my onward flight.