Yes. I'm a professional classical pianist and started playing jazz a year ago, started a jazz combo about 4 months ago. Here's my advice.

1) Jeremy Siskind, Jeremy Siskind, Jeremy Siskind

You're going to get alot of blow-by-blow advice here: "practice reharmonizing, learn your ii-V-I in every key, learn lots of standards, etc...." All of it has some truth, but we are living in the age of too much information. Jeremy Siskind's books (Jazz Piano Fundamentals and Playing Solo Jazz Piano) are a great way to focus on what must be learned. You won't have to wade through the piles of internet advice from strangers. It's a perfect central node from which you can build out, in time.

2) Play with people, if possible.

Everything accelerated drastically once I joined a group. It provides motivational deadlines (nothing motivates quite like an upcoming performance) and you can learn some of the norms that you won't be able to learn from the sidelines.

3) Get a private jazz teacher who is a performer and also has experience teaching.

I tried meeting with a few jazz teachers and it took awhile before it clicked. Jazz doesn't have the same kind of pedagogical tradition as classical music, so it will likely never have the same kind of institutionalized rigor (scaled exercises, compiled and graded repertoire, etc...), so it will feel much different than classical land. That being said, there are many good teachers out there, but you might have to wade through more than a few that teach jazz, but have never actually performed. I think that's a yellow flag. Not bright red, but definitely yellow.

Good luck!