If you have no experience using a clutch & gear shifter then a starter bike can be any bike where you are flat footed at a stop ,powerplant size is irrelevant , having control over weight at a stop is , once the bikes moving weight & height are irrelevant .
I taught my wife to ride on a little kawasaki 400 cc & she was ready to move up within a week , next she got my 1974 1,000 cc XLCH iron head sporty with right foot shifter & she rode that for a few seasons then wanted to move up again , i let her ride my fathers 72 FX stroker he left me ,she only weighs 110 lbs & stands 5 ft 4 inches , she rode that big shovel head over 10 yrs until i got her an EVO .
I bought her a 93 Evoloution Fatboy new in 94 & that bike is 1,340 cc , she rode it stock the 1st yr tippy toed at a stop so i lowered it for her using the same kit that you'd use on your pop's softail ,i then put a saddle seat off a 93 softail on it for her lowering it even further , EVO softails can be lowered 7 full inches at the crotch with bolt on parts ,it was the 1st bike she had both feet on the ground with any knee bend , the more knee bend you have at a stop the more control you have over the weight but its not a must , she got by about 15 yrs with one foot planted .
Her little ass could ride my Buell Lightning X1 which is a 1,203 cc Harley crotch rocket , she rode the shit out of that big ass bike & its the fastest scooter we own , she has to one leg stop the X1 but could ride the shit out of it, she wanted a Buell of her own so i got her a Buell blast she lost interest in quick & went back to her fatboy .
The only bikes we own she has real problems with is the 1,550 cc Road King , its way too high & not set up for a small person so she cant handle the bike safely , she cant ride my Panhead either but she can hold it up no problem , the rocker clutch ( Foot clutch ) & tank shifter confuse the hell out of her but thats the only reason she cant ride it .
If you know how to drive a stick shift car then standard foot shift hand clutch bikes shouldnt be hard to learn to operate safely , my advice is this , if your after an HD dont go out & buy an 883 sporty ,everybody who buys an 883 allways upgrades to a big twin .
I ran down the evolution of my wifes upgrade in bikes to show you one thing , buy the bike you want to start with ,ive been riding my fathers panhead over 40 yrs since he bought his shovel in 72 & still love that old pan, if there is something about the bike you truly want thats not comfortable as is then change it , examples are foot pegs to floor boards , seat height , frame height ect , all easy mods .