I'd recommend learning to ride first, and enjoy the lightweight mobility of a smaller bike. My first bike was a Suzuki GS500E - parallel twin 4 stroke. Very low power, low weight.
Once you become comfortable and confident more power may prove fun.
I'd ride different bikes to see what combination of power and weight makes you happiest.
I owned 32 bikes over the years.
Favs included:
RS125 Honda - track bike, 2 stroke, low power, super low weight
RZ350 Yamaha - street bike, 2 stroke, lower power, lower weight
GSXR750 Suzuki - street bike, 4 stroke, mid power, lower weight
GSXR1100 Suzuki - street bike, 4 stroke, higher power, higher weight
They are ALL fun, get the best from each bike!