no. "Good night!" is the wrong greeting. you take leave saying that in english, but we never do that with "Dobrý večer!" however, i can (and will) remove "A good night!" and "A good evening!" if that is the price for being able to reject the clearly wrong greeting.
"Officially," the stress in Czech is always on the first syllable. But it often SOUNDS like it's somewhere else, when long vowels appear in other syllables.
Having to spell Czech words is wrong, because most of us don't have a Czech alphabet on our devices.
It looks like you're just getting started on your Czech adventure. Installing a Czech keyboard will make things easier. A simple Google search should tell you where to find one for your device and how to install it.
On mobile, holding down the letter should provide the letter with the special accents.
On desktop, you can use the character mapping tool to find the "alt+[code]" combination for all characters.