I am a newbie to commuting on a bike and as of yet, love it

Hoping to get some recommendations on where to buy (online or in Seattle) the following

Light (headlight and for visibility to others)
Womens reflective vest
Commuter bag -i have a laptop

Also curious what is in your bag that is specific to commuting-towel/wipes?, etc. wondering what are the requisites in order to commute to work

Thank you