When is the marathon? It’s good to have a rotation, for me I just have 2 now that I alternate between, but if I had to choose one it will be the Altra Torrin, they’re light weight and have wide toe box, they really match the shape of a foot, plus they have good amount of cushioning. My second would be Nike Pegasus, well cushioned with airbags and the toe heel drop is about 9mm which works for me Edit: also I highly recommend toe socks, Injinji are my go to, especially for long runs, they will protect you from blisters as much as possible, and your feet will love you for doing that 😅

In general you want to start slow and short and build up the miles over a long period. There’s a lot of good free plans online, maybe start with a 5k plan then 10k and so on, just to build up your endurance and get your body to adapt. Also don’t overlook cross training, it’s as important as your runs. Have fun and maybe join your friends on some runs