I have a Panasoinc Lumix FZ30 "SLR-like" camera  

It can take raw images.
It has ISO speed between 80 and 400 and max aperture f2.8  

and max 60 seconds of exposure time.

I am really eager to take photographs of milky-way, stars, ...  

and tried a lot, but haven't achieved much.

Can I do these sort of things with this camera?  

or do I need to buy some extra filters or lenses ...  

or should I take pictures in specific time or date or place?