1. Every time I really start rolling and headed for the enemy homeworld though I get set back by pirates coming for one of my planets and my offensive stalls while I go kill them, meantime the computer starts taking back the planet(s) I just smashed.
1. Turn off pirates. Non-newbs don't play with pirates turned on in MP because then you aren't pitting your skill against a human, you are throwing a random AI element into the equation.
2. If you want to play with them on, figure out which worlds the pirates will attack (generally the closest worlds they can get to). Fortify a strategic spot in those grav wells with lots of turrets and repair bays. If you have Entrenchment (highly recommended), build a starbase there too, and mines. Also, hanger bays. Finally, to soak up all the free experience and gain levels, build a capship and set it there right in the middle of the turrets and repair bays on "hold position."
2. My economy really starts to stall after I get the second fleet size upgrade. I build a trade port at every world that isn't on my front line, but just can't seem to keep up.
You have to build trade correctly. You want to build out a long, single unbroken line of trade ports. See another post on how to do this.
3. I have trouble holding my choke point systems. The best I can seem to do is just mass repair buildings around my extractors, but it doesn't do anything to keep my planet from getting bombed.
See #2 above. Also, fighters are what counter siege frigates (planet bombers) so build hanger bays. Cheap scouts are effective against them too.
Any advice would be appreciated. Also, if any of you don't mind playing with a new guy on the team what time approximately do you play? I'd love to watch some people who know what they're doing.
PM me.
EDIT: I was surprised to see some of the more experienced players, like Darvin, say that trade isn't all its cracked up to be, blah blah. While I certainly respect his skill level as a player, I will say I have to disagree. In a non-rush situation, I find that getting trade up as early as possible is a top priority. Most times I'd have trade ready to go by the time I get a string of 3-4 planets. This is especially true when you are playing against a normal AI.
Against a human in 1v1 on small random map, the same thing applies (he's far enough away from you where you can have trade up before you are rushed). On pointblank map, you wouldn't want to go for trade, of course.
I you want eco as vasari, I recommend starting with the egg and gobbling up planets like a fat man at a buffet. Also, with vasari, it is somewhat acceptable to forgoe trade at first in lieu of getting refineries, but you have to have a good spot to put them (do NOT just spam them anywhere), and you'd want to research the mineral upgrades. Also, before you spam trade ports or refineries as vasari, I recommend getting the tier 3 upgrade (both levels) which makes all structures and ships cheaper. Also, make sure you conquer and hold as many neutral resource areas as possible. Do all this and your money should be flowing in faster than you can spend it.