Board Thread:General Discussion/@comment-171.6.169.244-20150325231045/@comment-460323-20150325235714

Given that the main part of the game is probably the quarterly events, you'll want to have 2~3 of each class at least to satisfy the possible branching rules of the map. Ship composition is always chosen based on the need and limitation of the map so it doesn't matter what you choose now; it won't stay. Unless you mind getting wrecked over and over again by Ru-FS, choosing ships by favoritism is absolutely fine.

Back to your question, any composition is ok for the first 2 world. You should start leveling a few BBs when you reach the second world though so that you'll be ready to tackle 2-4.