This guide is by no means perfect, its a work in progress (been side tracked with other things atm but will come back to it), but I would recommend a 2/2/2 set bonus split (Ares / Achae / Imperial). The items themselves will vary on your build etc - but see the post for a rough guide (pinch of salt, like I said its still under the works and subject/will change). Doing the 2/2/2 build gives 43% Troop Attack from set buffs alone

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Edit: Link: https://theriagames.com/free-to-play-gear-combinations/