Shifting, when?

So I was driving my car from one lot to another today to get it closr to the dorm, and a friend came along with me (to laugh at my driving a stick)

Well I didnt stall, but almost did twice.

Anyways, seeing as my car has no tach, Im not really sure when to shift, and I feel like I am shifting too early and keeping the rpms too low.

So what would you guys reccomend as good "shift speeds"

my dad thinks i should
take 1st to about 20mph
take 2nd to about 30-35 mph
take 3rd to about 40-45mph
take 4th into about 50-60 mph

a friend who drives stick though says I should go about 10 mph less on average then my dad.