Help needed in constructing my own spell checker plugin

I am new to CKEditor and I need help to get started. I want to develop a simple spell checker. I send data from my editor to server which returns json with word errors and suggestions. So I have all json objects that I need in javascript.

What I want to acomplish now is to highlight words in my editor which contains errors and let user select a word from suggestions to replace that error (maybe list of suggested words can be on right mouse click).

Can someone please give me advice where to start and what functions in CKEditor API to look and use? I know that there is spell checker like Scayt, but I need to develop my own to use with my language. Maybe I can privide already made spell checker with spell checking on my server?

Thanks in advance!