Playoff tickets

During the time of April 22nd and April 29th I have guests from
overseas here in Tampa from. I would love to take them to a hockey
game. As the regular season ends at April 18th I am hoping for a
playoff game.

I saw that on ticketmaster tickets for the first two games are on sale
but no date scheduled yet. When do the playoff games normally start?
Right after the end of the season? When will the games definitely be
scheduled? As soon as Tampa is definitely qualified for the playoffs?
Is there a big run for the tickets, do I have to order tickets in
advance to make sure I get a seat, or can I (as in the regular season
games) just buy ticks before the games?

A lot of questions... thanks for your answers!