Found an abandoned motorized bicycle by my complex's trash. I'm interested in fixing it up but I need some guidance. Pics inside for reference.

Hey everyone, I found a cool motorized bicycle HERE that was left to die. I plan on fixing it up but, with little mechanical experience, it should be pretty interesting! Also, sorry if this is the wrong sub. I took a couple minutes to decide if this should go on r/bicycles or here. I have a couple of questions before I start going crazy.1.The handbrake seems to work in reverse. When it's depressed, the brake is open allowing the bike to move. When it's released, the brakes work to stop the bike. Is this normal?2.There is some sediment in the fuel filter that's shown in one of the pictures in the album. Should that part be replaced entirely?What else should I be looking into if I want to get this thing up and running?I plan on cleaning it up a little bit today. Because of the heat and dust it's looking a little dingy. Any help is greatly appreciated. Thank you!Edited: to fix image link via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/cacq4w/found_an_abandoned_motorized_bicycle_by_my/?utm_source=ifttt