I have a worksheet that is my pricelist. It contains columns representing
retail price, my cost, part number, and description.

1) I have another worksheet in my workbook that I want to use for quoting.
I
would like to be able to simply type in the part number and have the rest
of
the field auto populate from the pricelist.

Firstly, re-order your pricelist columns so that part number is the first.
Then you can use VLOOKUP, eg:

=VLOOKUP(A2,PriceList!$A$2:$D$4,2,FALSE)

where A2 = cell on Quote sheet where you entered the part number ;
PriceList!$A$2:$D$4 = your pricelist table ; & 2 = the pricelist table
column from which you need the info (in this case, the 2nd column, whatever
that contains.

2) I would also like to have rows on the quote sheet that don't contain
any
information to be autohidden (if this is possible).

You can do this with a macro, AKA VBA. Or you can select the range (that may
contain blanks) and F5 -- Special -- Blanks -- OK, and then Format -- Row --
Hide.

HTH,
Andy