Well if I know everything as of book 10 I'd find a Chee, find some way to get my hands on the Blade Ship . . . once I had that (and . . . you know, a crew) I'd out run the pool ship get to really learn how to use the ship properly for about a week with the help of said Chee, and then, so that said Chee didn't end up violating any of their internal laws, try to negotiate with the Yeerks while similtaneously requesting Andalite help since as of book ten we didn't know what kind of selfish jerks the Andalites were so like the Animorphs themselves (who may or may not be on my Blade Ship crew) we'd probably trust them.
And thus the Andalites and Humans would form what I'd call the Star League, the Blade Ship, which I would rename Invisible Truth, would be the flag ship of the Star League Defense Force, and then we'd start the Babylon project mostly so I could fill my Blade Ship with Star Furies instead of those clunky bug fighters, building the first four Babylon stations out of legos and knocking them over so we could just skip on to Babylon #5 (or else skip to #6 so we don't get sued) then, with humanity and Andalite....ity united and touring the stars . . . I'd just wait for the human need to conquer to set in, watch as humans begin to act like their usual pushy selves and tick the Andalites off, I'd watch, wait, prepare and hope it happened before the small personal kandrona I kept in my quarters wore out and my human host freed himself, and when the time came, when Humans and Andalites waged their war Invisible Truth and a fleet of trusted vessels would jump into the Yeerk's solar system and decimate the Andalite fleet presence there, free the rest of the Yeerks and take both humans and Andalites while they're too busy playing war, then, with myself as the new Emperor of the council, I'd take my solar empire and pay a visit to those mysterious Kelbrid thingies.
Oh, and did I mention muahahahahahahahaha ha!