Nissan Micra CC Faults 2006

Hello, I wanted to know if anyone could help me with a problem that I have
a few months ago I bought a second -handed nissan micra cabrio and last week I broke, according to what the mechanic told me because those cars bring a whole failure in the starting system what I have burned everything. Having no idea I do not really charge me is what it is worth ...
Thank you very much
greetings!