Best thing I found was to start out on a flat area, and feather the clutch to get the car to move *without touching the gas*. That makes you get a good feel for the friction point. Then practice hitting the friction point while giving it a little gas. Then, try starting up gradually steeper hills.
Don't be surprised if you stall or make some bad launches a few times. I remember the first day I bought a stickshift car and was trying to start off up a hill. Tried once, stalled. Tried again, stalled. Fired it back up, said "Dammit I'm not gonna stall THIS time", dumped the clutch at 3000 rpm, and left about 20 feet of rubber.
That car was tricky even after a good bit of experience. It was a Thunderbird with a turbo 4-banger. It had *no power whatsoever* until the turbo kicked in, then all of a sudden it would decide to wake up and take off like a bat out of hell. Lots of fun in inclement weather!