Any advice on a 5 hour flight with a one year old in my lap and my anxiety is so bad and I’m scared to fly this will be my 2nd time but yes
We pack the kids tablets, coloring stuff, snacks, blanket and a small toy.
A tablet with some educational shows downloaded or a movie you could watch together. Some suction toys you can stick to the window or tray.
I suggest a MILD sedative. And distractions, snacks & maybe books
Get a seat with their car seat. But for real that 5 hour flight turns to 10 with a kid in your arms.
Tablet with downloaded shoes. Snacks galore. Go to the dollar tree and get crayons and markers and craft kits etc. We do this every few months since birth and snacks water bottle that you can fill up once through TSA and crafts are so key. 
Join Flying with Toddlers Facebook group
Make lists:
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items to bring on carryon (toys/entertainment)
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schedule of every minute the day prior and day of
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know what you and baby will wear, have it laid out
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find out car seat/stroller policy of your airline
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diaper bag: trash bags, extra clothes, paci wipes, lysol wipes
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if no iPad for baby, download Ms. Rachel (or whatever they like) to your phone on YouTube and you can have baby watch those videos with no internet connection
Take a pic with the pilot in the cockpit!!!
My 18 month old spent over an hour playing with these stickers. It was a 3 hour flight. 3D Stickers for Kids Toddlers 550+ Vivid Puffy Kids Stickers 24 Different Sheets, Colored 3D Stickers for Boys Girls Teachers, Reward, Craft Scrapbooking https://a.co/d/bWRVFPY
Dollar tree toys, window gel clings to use on the tray (this is my son’s favorite!), suckers, tablet with videos downloaded