You can't buy a ship for 7k.
There is no construction at the moment, so the only way to get a ship is from another player.
Your best bet is to join a faction and see if they'll pick you up and assign you a ship. Most factions also pay some kind of monthly wage so you can start saving up for one of your own.
Your other option is to collect CPs and start saving up for a ship using those.
____________"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Only fools and children dream of heroes.