Suggestion for E-M5 (free) accessory

Thank you very much for the precious advice.

I will get the flash even tho I am not much of a flash user. As for the other lenses, I will start by the kit and increase my collection as the time goes, its quite a big investement.

I am also considering the HLD-6, but only for the right hand grip, but I find its way too costy for what it is, so I am not sure, will try to find one to try and see.

Should I get filters for the lens ? If so, which ones ?