However this being said i still need some tips. While playing with a different faction i was able to capture an enemy metal/crystal extractor and that helped a lot. I was wondering if the advent rebel had a ship which could also do this.
Every faction can do this if the extract is in an uncolonizeable gravity well. The Vasari have it on their scouts, the others on their colony ships.
Also what is the best route to take with the frigates and the smaller ships? I usually take the mother ships class and a few smaller ships and capture planets ect.
Expanding fast is the key early game. Build a mother ship and have it take a volcanic or ice by itself, while you send some frigates and a colony frigate to take asteroids or moons at the same time. Try to switch to Corvettes or Flak ASAP instead of Light Frigates.
What should i research first? Usually i go for planet colonization,trading,security and then weapons and i usually beef up the weapons when i build a titan as i tend to have large amounts of money by then.
Don't get trade too early. The fastest way to make money is to colonize planets and build the minimum population upgrades and extractors, and this sets you up for having more research labs and trade ports later.
If you have any other pointers with diplomacy please add those as i am a fairly new player with just under 11 hours on my plate.
Try to get the relationship upgrade techs as fast as possible, and try to figure out which one of your neighbors is most likely to attack you and destroy as much of their stuff as possible. Other players like people who blow up their enemies, so if you're just turtling or avoiding combat you might have a harder time making allies. Your first goal should be to get a trade treaty, as this will allow relations to slowly increase on their own (assuming you have trade ports). One thing to keep in mind that throws off new players is that you cannot arbitrarily decide how much you like a faction. Diplomacy is two way, so if one player is constantly blowing up your ships your people will probably hate them, preventing you from doing any sort of diplomacy with them.
As the Advent Rebels, you have decent Diplomatic options, especially with the TEC Loyalists or Vasari Rebels (plus yourself of course). The Vasari Loyalists don't particularly like you but its not impossible, but the TEC Rebels and Advent Loyalists will hate you quite a bit, so it will be very difficult if not impossible to make allies with these two factions.