if you played any souls game, then this should be a cake walk. the raids are considerable easy as their attacks are all the same without variation for the most part. At the start you should try to fight them because of the xp you get from the raid and even if you die it just means you dont have to deal with food and hunger till later. If you want to skip it just save and load the game and it ends the raid.Damn, I just started the game, and it send me a raid almost immediately, and it seems a bit op, what are you supposed to do? just run? (Although it seem you can cheese it very easily by doing the maze + spike traps strat)
For fighting the raid you just need a good weapon and invest some points into Attack to start killing stuff easily