For the OP
I would suggest spending some time on the red team as an unalligned nation while you scour the communications hub on Plant Bob [ooc]these forums[/ooc] for the kind of alliance you wish to be associated with. You would also go to the public data library [ooc]wiki[/ooc] to look up the various charters and constitutions of the multiple alliances there.
You are in a good position since you now have had a lot of good people give you suggestions and ways and means to decide upon the alliance you wish to join, better than the average new nation that just joins an alliance because they liked the recruitment propaganda of a particular alliance.
Once you have a short list of alliances you feel would be good for you to join, you could always get on to the back channels of communication also referred to as IRC and visit their channels, talk to a few of their members and then make up your mind.
Welcome to planet Bob/digiterra; have fun.
Edit: Spellings