New set up advice please!

Hi,

I have just bought a Juwel 400 from ebay:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...DME:L:RTQ:UK:1

My plan is to set this tank into a marine tank. I have read various stuff
online about how to do it but am a little unsure as to advice from other
people as I feel getting a variety of opinions is better than just a few who
have a profit to make (ie aquatic shops).

The size of the tank is 151cm x 62cm x 51cm.

It has its own heater but am unsure whether the canister filter which comes
with it is capable of doing the job for a marine tank - it was previously
used as a tropical tank.

I have been advised to get a wet/dry filter with built in protein skimmer.
Are there any quiet ones which are reasonably priced which anyone can
recommend?

I am unsure about whether to keep just fish or coral as well. What are the
differences between running a fish only tank and one with fish and coral?

Basically I want a list of what I am gonna need to set this monster up!

ps I am from the UK.