(PSN)Solstafira

Hello, i started the new war cause people told me i didn't need to upgrade my railjack, just own one I got to the first railjack part and cannot get through it. I need to travel 10000 meters to the mothership while being attacked by sentient fighters. My hull is 1000 and my guns are weak. Can only kill one or two fighters if i'm lucky and cannot even travel a third of the distance before i get destroyed. What should i do?