Where is the place that I can see a rocket launch??

If you go to their website they have tickets and launch times listed. The next launch is at MARCH 13, 2019 6:58 PM EDT. The LC-39 Observation Gantry is where I would recommend.

If you don't wanna get tickets for KSC but you wanna see a launch, check out the A. Max Brewer bridge. We watched the DM-1 launch from there and it was great!

When is the next launch in april?

If the launch is scheduled you can see the Rocket. Yes you can see a rocket launch!