The AFC North side have brought in a new offensive coordinator and quarterbacks coach since the end of the regular season.
The head coach told reporters: "We want to build a system, so we're going to build a Ravens' system that's best for our guys in terms of their talents, that's best for our guys in terms of their ability to learn and get things right.
"We've got to get our assignments right, so let's build it from the ground up and build it well. That's what we plan on doing.
"A system has to work together. You can't piecemeal a system, you've got to build it in a way that makes sense to the guys. One word builds off another word, so it makes sense to the guys, and they can have an organised thought process into their responsibilities."
Last season's Super Bowl champions missed out on a place in the playoffs this year.