Hahahaha never miss an opportunity!!
Thumb up for that lol
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Hahahaha never miss an opportunity!!
Thumb up for that lol
Hey
My advice is find someone who is already doing what you are wanting to achieve that is in the same niche as you, then follow their followers and add real value to your followers.
Following users will get you noticed and you will get some followers back from it but don't over do it thats just spam! 
Also consider some competitions etc a good start is http://competwition.com/ this will get you some followers pretty quickly, just be sure to set it to a 30 day comp to maximise your followers.
Remember though add value, engage with people and don't spam.
Hope this helps
This should help and I'm sure its transferable to rank in google.fr
http://www.blogstorm.co.uk/how-to-rank-higher-in-google-places-local-in-the-uk/
Yea I agree if everything is kept the same you shouldn't see much difference but you should expect a drop and prepare for this.
That said you need to ensure the new CMS is capable of accommodation the changes, again be well prepared.
If you intent to make changes then ensure you follow all the necessary steps and procedures that come with a site migration.
As it effected the ranking last time you can be sure it will happen again, you might want to ask yourself why your wanting to change content management systems and weight up the pros and cons, I have a site on CMSMS and I personally don't like it but each to their own 