BEREA, Ohio - Johnny Manziel expects life in the NFL to be even crazier than college.

Selected in the first round of the draft by the Cleveland Browns, Manziel was introduced Friday to a soundtrack of whirring cameras as he took the initial steps of his pro career. Humble and self-assured, Manziel, who raised Texas A&M's profile with his playmaking ability and "Johnny Football" persona, said he's entering the league expecting the spotlight to be brighter.

"I'm going in expecting madness," he said.

Manziel says he's learned from past mistakes and the 21-year-old vowed to earn the respect of his new Cleveland teammates, some of whom may have their doubts about him.

His arrival in Cleveland has already triggered "Manzielmania" as the Browns have been overwhelmed with sales of season tickets in the hours since they drafted the former Heisman Trophy winner with the No. 22 overall pick on Thursday night. There were fans waiting outside the team's headquarters to welcome Manziel when he arrived shortly before noon.

"It means a lot to me obviously, getting a lot of support already," Manziel said of the buzz he's created. "But there's work that needs to be done. There's things that need to be done. I'm very excited, very eager to be here and really get things rolling."