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HP is the High pressure side. Most regs have one or two. One is normally all thats needed but there are a few cases where two are used. One is for AI computers with SPG backup. Another is a pony system which uses a HP hose with check valve to fill the pony. (permanently attached)
As for LP hoses, 4 is generally a good number. 2 ports for 2nd stages, 1 port for the BC inflator and 1 port for a Drysuit inflator.
I don't think there is any difference between LP and MP.
Will you need all of them now - probably not. You might want them in the future though.
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