With eight years of "Magnum, P.I." behind him, Tom Selleck is enjoying a birght future in movies, his new wife, Jillie, and their new daughter, Hanna.

Last year his "Three Men and a Baby" yielded some $240 million worldwide at the box office. His latest film is the comedy "Her Alibi," co-starring Paulina Porizkova and currently he is working on his first dramatic film, "Hard Rain."He has pulled up stakes in Hawaii, where "Magnum, P.I." was produced and moved into a new home about 40 miles from Los Angeles.

Hannah was born about a month ago. Of his new lifestyle, Selleck, 44, one of the most handsome hunks in show biz, is a happy man.

"My baic values are still the same," he said, "I was in a position to lead the ideal bachelor life except I was eating sleeping and working on the series ('Magnum') and had little time for anything else. And in the long run that wasn't what I wanted.

"I shied away from relationships for quite a while because of how upsetting it is when they break up, which is what happened to my first marriage.

"Marriage and becoming a father reminds you of what's really important. It's almost instinctive and chemical as opposed to intellectual. I miss `Magnum.' I miss the character, but it was time to leave. That was a personal decision about family life and priorities. For eight years I'd put work ahead of my family and I thought it was time to get that back in proper perspective."

His new lifestyle has included some professional changes as well.

"I never had the luxury of thinking about the next three pictures, or if to mix them up as to subject and style," he said. "It's a nice opportunity to confront that.

"Between plannning around my personal life and planning ahead in pictures, I'm real happy about having that luxury, which I never had before. My career was decided for me and I just took the best material that came along."

Selleck settled on "Her Alibi" as his first post-"Magnum" project for several reasons.

"To begin with," he said, "I'd been looking for a romantic comedy for a long time and it either didn't fit when I had time off from `Magnum' or they just didn't come along or nobody touted me for the good ones.

"I was pleased with the script because it was written by Charlie Peters who had polished the screenplay for `Three Men and a Baby.' I was still doing `Magnum' when they offered it to me and I didn't have time to put the rest of the package together.

"When they came to me with Bruce Beresford as the director, it took me 10 seconds to say yes. I'm pleased with the way it turned out. At a sneak preview they laughed a lot. It's a picture about sexual tension. The sexier it is the funnier it gets.

"I play a writer with terminal writer's block who hangs out in courtrooms hoping to find material, when this beautiful girl walks in on trial for murder (Porizkova). He instinctively believes she's innocent and provides her with an alibi. It's the kind of comedy that has to be played for real.

"The next picture, `Hard Rain,' is quite different. It's a very serious drama. Hopefully, I'm not doing it to prove anything. I took the part to keep interested in my work. Selfishly, I'd like to be able to do as many different kinds of things as I can.

"In `Magnum' we did so many different stories it kept acting interesting for me. That will keep feature films interesting for me, too. I want to mix it up a little."

He has also seen some action behind the camera recently, something he hadn't planned on, but a satisfying experience.

"When `Her Alibi' was finished I needed a rest and wanted to stop acting. I knew Jillie was pregnant and I wanted to be there for that," he said. "And after the baby came I wanted to be around.

"What happened is that I got busy producing Burt Reynolds' new TV series, `B.L. Stryker,' which Universal asked me to do. It was flattering and a little intimidating. I had produced the last two years of `Magnum' and they figured I could do it.

Selleck said Reynolds had been something of a mentor to him at one time and that they have a great deal in common at this point in their lives. Both are relatively newly married and both are new parents.

"The good thing about the series is Burt worked near his home in Jupiter (Fla.) so he could be with Loni and his son," Selleck said. "He can go to work in 10 minutes and be home every night. That's why he decided to do the series.

"And I like living and working here in Southern California. In the last eight or nine years there have been some hills and valleys in my career.

"Now it's nice to be home watching the baby grow. It seems to be what I want to do right now. It's hard to get that fire going to go back to work."

"Jillie and I talked for a long time during 'Magnum' about getting married and having kids, but we knew it would be impossible while I was doing the show...

"So we waited, and I guess we were smart because things are great."