Hi guys, I'm a noob

and I didn't get the timing chain secure after taking off the cams. How do I fix this? I find a lot of info about replacing the chain by following the old chain but no info if you have no clue where it should be. I noticed there are 2 other sprockets besides the crank, are those crucial as to the position as well

Its a 85 500SEL M117.963 Sorry for the long post.
Thanks guys!