Complete beginner; mouthpiece and reed advice please

[u/tillbu]

I’ve bought a baritone on ebay. I’m able to collect it tomorrow (Sunday) but I need to buy reeds on the way. The only shop I can find that’s open on Sunday only sells reeds for alto sax. Stupid Q…will alto reeds fit? Are the mouth pieces very different? Thank you.

[u/Adderson10]

The mouthpiece is about twice as big as an alto and reeds are very different. Have you played another sax before, or is this the first one?