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You can use also an online-dictionary, i.e. this one:

supper:
lingvo.ru

ужинать:
lingvo.ru

Oh, by the way, coldspell, we are sorry, we have forgotten to answer your third question (really, you wrote "few questions", not "two questions", yes!). I mean this one:



So, my answer is:...

Yes. Сегодня is pronounced [си-вод-ня]


"Я хочу иметь ужин" is wrong. It doesn't sound Russian. The correct variant is: Я хочу поужинать.