Yesterday we played the game the first time and even though we watched a rule video and read the rules there were lots of questions and problems. (some came from translation errors on cards of the german version)
1) Lord Godalming has allready 3 item cards and uses his action to get another 2. how does the timing work. do you play it like the train tickets? (you discard 1 item -> now you have 2 -> you draw 1 -> you discard another item -> draw the 2nd and now have 3 items again) ?
When drawing items, you draw first and then discard, this is stated in the FAQ
Q: What happens if a hunter draws item cards when he is already at his hand limit?
A: After drawing, he immediately discards down to his hand limit.
I take from the use of plural cards in the question that Godalming would draw 2 items and then discard 1 or 2.
2) if the encounter card on a city is face up (for example due to a event card) and a hunter moves into the city, may dracula still ambush him with it? what happens if a 2nd player moves into that city?
The reference guide states
Dracula may ambush with an encounter card that is already revealed.
If a second hunter entered the city, they could be ambushed if the encounter was still there.
3) in the shut up and sit down rules video they mention that if you use a train item you have to go the whole distance. (e.g. you have a white 2 and use the ticket you HAVE to move 2 spaces per train) i cant find anything about it in the rules.
See the reference guide under movement
After spending a ticket token, the hunter can move to a city that
is up to a number of railways away from his current location
equal to the number on the spent ticket token
SUSD are wrong if they say you have to move the full amount.
4) during draculas movement step all cards are moved to the right and one location card drops off the board. can you move there in THIS movement step or do you have to wait till the next?
Yes you can because sliding the cards happens before placing a new card on the trail.