Man.... that start is real bad... although it has decent settling spots if you consider the luxury options: wine from capital, copper-marble-dyes from expansion.
If you have the guts to move your settler on the first turn AND to go early warmonger, I suggest this:
That scheme places all cities 4 tiles apart from each other, which I love. I don't know build orders very well, but I think 2 points in honor for dat general, plus archery for some 4 archers to siege valetta and kongo asap. You're so close to William and Elizabeth that they'll likely meet you very early, and thus hate your warmongerng, so just cripple them as hard as possible, since you'll be enemies forever [warmonger decay rate is ridiculously slow in this game].
If this is a small continent with just the 3 of you, it might be possible to eliminate them withou the world noticing. Raze everything but the capitals, and re-settle if/when possible as the sources of hapiness increase [zoos, social policies, maybe religion stuff like pagodas].
That's if you want those horses a lot, and to make sure the AI don't push 2 military city-states upon you - which they will do if/when they DoW you. You can always just settle those 4 spots I marked and go the bread'n butter "peaceful 4-cities tradition" that everyone talks about.
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EDIT: lol, I just noticed the roman warrior; that continent may be bigger than we think and you just got the short end of the stick. If you're playing Immortal/Dity, just reload your game, bro. Otherwise, settle those spots I marked and go peaceful; hope that William makes a decent religion and stick with it.