I use specific plugins on my C2 projects exists some way to compile from C2 onto C3 using that plugins? for example "Canvas".
There are some options. Check if the plugins you use were ported:
If not, there are plugins that do basically the same thing, but it will require you to adapt your code manually. For example, if the canvas plugin wasn´t ported, there is now an official canvas plugin. Just make sure beforehand that the new plugin can do what you need it to.
Exists currently some C2 updated plugin or method with GRPD and App id for admob? while I migrate that plugins to C3.
I´m not sure about that one.