You can unlock a few good teams and item by going to the home menu and selecting features, then extras, then codes. enter these codes to unlock teams and items.

Item	How to unlock
2k China team	2kchina
2K Sports team	2ksports
ABA ball (Red,Blue,and White ball)	payrespect
Bobcats NASCAR uniform	agsntrccai
Cavaliers Cavfanatic uniform	aifnaatccv
Hardwood Classics Nights uniforms	wasshcicsl
Hornets Mardi Gras uniform	asrdirmga
Jordan sneakers collection	23
NBA 2K development team	nba2k
Secondary road uniforms (Grizzlies, Hawks, Mavericks, and Rockets)	eydonscar
St. Patrick's Day uniforms (Bulls, Celtics, Knicks, and Raptors)	riiasgerh
Trailblazers "Rip City" uniform	ycprtii
Visual Concepts team	vcteam