do i only have 2, 4 wheel drive modes the 2 wheel hi is my regular driving gear.
Correct. There are two, 4-Wheel drive modes.. 4-HI and 4-LO. You'd use 4-HI when roads are slippery, moderate to heavy snow, ice, loose sand, shallow mud, etc. You'd use 4-LO if you were super stuck, in deep heavy snow that required a lot of torque to pull out of, or other situations where 4-HI just doesn't provide enough torque to get you through.
2-wheel HI is your normal daily driving mode.
If you had a Selec-Trac transfer case, you'd also have 4-wheel FULL TIME, which is essentially an AWD mode.