How do you say "So, yeah" in German?
So, yeah I need to get going.
Here's my attempt:
Also, muss ich verlassen.
Do you mean this as a filler word to end a conversation and turn away?
I think this differs from speaker to speaker.
A young person could say:
Ok, ich muss dann mal los.
Other informal ways are:
Also dann, ich gehe dann mal.
Na gut, ich muss (los).
Starting with „Also, …“ is possible, but I would expect it to be stretched in this context and with a short break before going on with this set phrase (e.g. „Alsooo … ich mache mich dann mal los.“)
In a more formal context I could imagine
Gut, ich muss mich (dann) auf den Weg machen.
Please note that especially the informal examples could be considered as rude when using them to end a conversation. If unsure, explain briefly why you have to leave.