missions are based on that both a red player and a blue player have to be avaiable for a mission since it's for PvP, if you can't do missions, it's smart to graind on marauders to gain resources, with these resources you can buy better levels for your damage, armor, engine and repair, and thats essential. When you have the full gear of your level then it's the best to go and level again, and that can take long.