A Motorcycle Safety Foundation class is a good beginning, it will save a lot of skin.
You said nothing about your size, but a small used bike is better than a big one, UNLESS you're a big man
(5'9+) Get a GOOD condition used bike ride it for a year and then sell it to another beginner and buy whatever you like. I don't think you're going to wrap it around a tree @ 80MPH, I think you'll fall over at a stop sign.
Cruisers are more rider and insurance friendly.
Today's Sport bikes are thinly disguised race bikes with lights, designed for experienced riders, but there are 20 questions here from ppl who like you have never ridden anything.
Almost any DOT approved helmet will do, but some are better. In the mid-'80's Bell helmets had their classic advertisement...if you have a $10 head, buy a $10 helmet. The new MODULAR helmets are an improvement.
Lace up or zippered boots are the ER nurses favorites. Gloves should be abrasion resistant, those cloth gardeners gloves aren't worth wearing.