[mrlmd1]

The helmet should at least have a DOT and/or Snell stamp of approval on it.
Don't buy one without that certification.
Try on a helmet to see if it fits, they come in all different sizes and head shapes. Don't buy on online unless you are replacing one you already had and you are sure of what it is.
And (we'll start this again), don't but a used helmet to save a few bucks, IMO.
I prefer full face, to save your chin and face as well as your head, and I don't think they restrict my vision.

For jackets - Leather is great for cooler weather, blocks out all the wind, mesh is better for warmer weather, allows some ventilation. Get both so you have a choice depending on the weather, don't have to buy them both at the same time.
Both should be armored/ padded for protection - that's why you have it on.

Get a good pair of heavy riding gloves for warmth in the colder weather and a lighter padded pair for warmer weather, as protection from road rash.

You also need a good pair of boots with nonslip soles and good ankle protection.

You may want to add armored pants or overpants, leather or fabric/cordura etc., to the list, especially useful in the cold.

If you search this site under gear, beginners, and other places, you 'll find many. many answers to those questions and more that you haven't thought of yet.
And even more ways to spend your money, the bike was just the beginning.