Hey there John. I used to live 15 minutes from Lake Tohopekaliga and my PB is from Tiger Lake on the Kissimmee Chain, caught in a tournament no less so ya know it was on artificials lol. In my humble opinion, February is the best month to go if you want a good shot at catching a 8+ pound fish. You can catch fish of that class any time of year, but if you go to this webpage and look at the bags, you'll see they peak in February: https://xbs.floridatournamentreport.com/lake-kissimmee-division/kissimmee-schedule-and-results/
If you're looking for a guide, I would recommend Chuck Pippin. I don't know Chuck personally, but I know his reputation and it's very good. I know he will do an all artificial trip if you want to. Here's his web page: https://www.chucksguideservice.com/guides.html
One thing I'll warn you about if you try to fish Florida lakes on your own with no prior experience, you can spend days trying to figure it out because like Roadwarrior said, it all looks good. I would strongly recommend getting a guide so you make the most of your trip.