Practically speaking, whoever you wish to hire a PA28 from will want to check you out on that a/craft (assuming you are hiring). If you've never flown one before, might be a couple of trips.
Before you fly, you should of course familiarise yourself with the POH, performance etc. Also typical power settings and rotate, climb, cruise, approach, flap speeds etc.
Learn as much as you can on the ground = less expense in the air.
It's the not the best time of year for it but I learned on a PA38 and then did a PA28 c/out combined with a night rating.