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swedeee-
Stem bolt will usually be around 5Nm but should be written on the stem. Expander plug bolt is as much as is necessary to stop it slipping upwards, but 5-8Nm should be fine. The torque for the stem cap bolt isn't really done by torque - it's enough to tighten up the headset bearings without having any play in them. Best done by feel rather than torque.
Unless you're the chap who did the pre-sale check on the bike I got my father from Cycle Surgery who diligently checked the torque on the stem cap bolt, despite the fact the stem was already securely in place. I didn't have the heart to tell him he was wasting his time.
Brommers
Expander bung tightening > stem > top cap tightening > stem bolt tightening
If you follow that order with a torque wrench you'll be fine. Spacer/tester cap on top is advisable.