Just hit Level 50 after starting from 1, thought it would be a good time to get some mutations.
Does no-one sell the serums anymore? Visited so many player camps and not even found one...
I've naturally got the Healing Factor and Speed Demon mutations from doing a couple of the Uranium Fever events and getting a lot of rads. Ideally after marsupial, herd mentality carnivore/herbivore.
If you see someone called Flibster in an orange space suit and white helmet, say Hi. I'll happily team up and provide a bit of cover. One of my favourite events to do early on to get junk and weapons to scrap is Collision Course, at Morgantown Airport. It does help if you have someone who can cripple the ghouls with legshots first so you don't get chased too much.
Don't worry about getting overloaded with weight. You will use AP to run, and can't sprint, but you can use use the auto move and set it to walk and you'll be fine. There's many workbenches around so it won't take too long to get somewhere to scrap everything. Many train stations about with access to your storage crate as well.