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I'm about 20 hours into my PPL, so maybe I just haven't gotten to this part yet.

Suppose I'm flying KFCM to KRNH and I want to request clearance across the bravo. How do I figure out which approach frequency to contact KMSP on?

From liveatc.net, it looks like approach is 121.2 or 126.5 (for low altitude). At skyvector, 121.2 and 126.5 are listed under Class B. From the Chart Supplements - neither of those frequencies appear. Am I just looking at the wrong information?

I found a similar case for KPBI where the approach frequency (124.6) doesn't show up on the chart supplemental.

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The example KFCM to KRNH starts under the Class B shelf, in this case you check KFCM's chart supplement, and it says, "MINNEAPOLIS APP/DEP CON 134.7":

enter image description here

Which also agrees with the sectional (shown below).

Zoom out in the sectional, and you'll note different frequencies to the NW and NE of the Class B, so if you're transitioning through, the frequency will depend on which direction you're coming from.

enter image description here
Minneapolis-St Paul TAC chart via skyvector.com

Definitely don't use liveatc for frequencies, as that's a hobbyist site.

If you're departing during the tower's operating hours, requesting flight following would be more practical. Also, see related:

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    $\begingroup$ +1 for answering the question asked although for practical purposes you might also mention flight following here. If you're on it then you don't have to worry about searching for frequencies because you'll always be talking to ATC. $\endgroup$ – Pondlife Mar 29 at 16:58
  • $\begingroup$ @Pondlife: done, thanks :) $\endgroup$ – ymb1 Mar 29 at 19:57
  • $\begingroup$ If I were flying the opposite way (KRNH-KFCM), how would I make that request if I had flight following already? Technically, I could avoid the entire Bravo space, but if I wanted to request a transition through the Bravo and over the airport would I put that request into FSS or after contacting approach? $\endgroup$ – Shuo Mar 29 at 20:52
  • $\begingroup$ @Shuo: After contacting approach, also see: Where does one request a VFR transition route through class B? $\endgroup$ – ymb1 Mar 29 at 21:47

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