I would not put so many of our cards on the table at once and try to speak in ways that don't reveal too much emotion or personality. Better to ask questions, and try to glean information from answers.
For example, something I would send would be along the lines of
Dear [team member] of the honourable [civilization],
As you may have noticed, we have met ingame. While we don't have a huge amount to say right now given the early stage of the game, we would like to send you this short note in advance of more serious diplomatic overtures.
For now, we are curious as to your intentions. We know your civilization benefits from [something about their unique unit or maybe their traits, eg Aggressive civ benefit from war], and we have our own preferences for the path this game would take. We would welcome cooperation, of course, when the opportunity for it arises.
Regards,
Team EggHeads.
For example, something I would send would be along the lines of
Dear [team member] of the honourable [civilization],
As you may have noticed, we have met ingame. While we don't have a huge amount to say right now given the early stage of the game, we would like to send you this short note in advance of more serious diplomatic overtures.
For now, we are curious as to your intentions. We know your civilization benefits from [something about their unique unit or maybe their traits, eg Aggressive civ benefit from war], and we have our own preferences for the path this game would take. We would welcome cooperation, of course, when the opportunity for it arises.
Regards,
Team EggHeads.