So yeah Galactic War... Retreat... But be aware that if you go back in the fight and you try the exact same thing you will get the exact same result... You have to try different thing to get another outcome...
If you are more of a visual personal how to progress you may try my road map that I created based on a youtube video... Find all the information here
You should start with farming Phoenix characters they are good for the first weeks/months of arena and you can unlock Palpatine and Thrawn with them eventually. Also Biggs and Wedge are great and make syre you get 5 scoundrels (Boba, Stormtrooper Han) for the credit heist
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If you are more of a visual personal how to progress you may try my road map that I created based on a youtube video... Find all the information here
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/160304/f2p-farming-road-map-helper-version-1-0