-[X]Secure a Base on Bloodstone: Lord Baratheon said that the fleet would need a base, not on Westeros, so why not choose the closest island to the Broken Arm, to Spotswood.
[X]Strike at the Heartland: The Enemy would never expect you to strike at Tyrosh. There was a chance there were Archon Loyalists in the city that would help you, and winning that would destroy the enemy's main supply base, treasury, and key manufacture. Perhaps draw their attention away from the western shores and turn back to the East.
[X]Write in: Propose a tri-pronged approach to divide the enemies attention by landing a mainly Cavalry force with Skirmish support in the Disputed Lands as close to Tyrosh as possible without entering into range or sight of their ships, this force shall be tasked to seek any and all targets they can logically attack who belong to Tyrosh and the 12's, supply caravans, holdings, traders, etc.