Welcome to the forum!
That's great you're starting now.
I don't do IP so I can't really answer your questions from that perspective... but I wouldn't think searing chicken would make any difference to any diet if you use a nonstick pan and no oil. Maybe I'm wrong. Like Mrs Snark suggested, the IP subforum might be a good place to ask. There are some great people there who've been doing IP for a while.
Best wishes and hope to see you around the forum lots!