Content creation

Hello, 

I'm looking to create a reaction test where someone needs to click a button to score their reactions to something changing within the video.

Say for example 'Click the button when you see the red apple' 
If someone clicks too early, they will get a low score, if they click as the apple appears a full mark and then a lower mark the longer it has been visible in the video.

I'm using the H5P plugin for Wordpress, is this possible?

Sorry for the stupid questions. I am playing around and trying to figure out the system.

Do I have to use the H5P website to create content? Is there a program or something to develop it offline?

Are we limited to using the content types on this website? Is there a finite number of content types?

I'm recreating an interactive activity that was developed for my client.  They want it to be exactly the same, so I have to add the same features that were used in the original version.  The original version has text that you can click on (a hyperlink) and a separate text/caption box pops with additional information about the topic. How do I add these pop up text boxes in h5p?  I can't seem to figure it out. I'm creating the interactive activities to be used in Canvas, so I'm creating directly at h5p.org.