Tummy workout?

Hi guys,
Im just starting out with MFP & trying to eat well and exercise.. No worries there :)
Buuut, I was wondering if people could suggest exercises they do to help reduce general tummy size.
I have a super basic level of fitness, have been trying sit up's and such, Im just not seeing results even though I have lost some weight.

Any help is greatly appreciated :)
Thanks guys!