For what it's worth, here is my basic starting strategy for masso:
There is only one hardfast rule: The only war you should ever be in is one that you decide to start!

I like to play industrialist (military and social production bonuses)

Take planet quality bonus, military production, and diplomatic bonuses

Don't bother with a poor starting position ctrl-n until you get something you like.

Sol should be PQ20 or higher.

Don't lease anything in the early phase of the game! You need to stay debt free to manage the tight economic margins

Crank military production to 100%. You will be losing money in your treasury, but this is still cheaper than leasing. Start cranking out colony ships. You should be able to get one every other turn.

Send about 200Million colonists in each ship

If you chose the PQ bonus, feel free to colonize planets of PQ 14, but I wouldn't take a 13 unless I really needed it for stratigic reasons.

If you get any morality events, always choose the good option. Planet quality bonus is an exception -- take the evil option in this case, but try hard to play as good otherwise.

Once you've built all the colony ships you need and they are on their way, keep an eye out for resources that are close by. If you happen to see any of these, crank out a contstructor or 2 and try and grab them before the A.I. does. If you don't see any, don't worry about it at this point.

Next set military production back down to 0. and move research and social spending up to 50% each. Research weapons theory, phasers, photons, and corvette. The idea here is to build a paper-tiger military with corvettes to keep the A.I. from seeing you as easy-pickin's.

Don't put everything into your social build queue. Things that improve economy, planet quality, and some manufacturing boosters are good. Generally though, nothing that costs more that 2 per turn to maintain.Only put shipyards and things like that on your best producing planets (+20PQ).

Don't build moral boosing projects until later in the game when you can afford them easily and when the planets are really getting overcrowed. At this point the huge planet populations (increased tax income) makes it worthwhile.

Once you are able to produce corvettes, set the sliders to about even so that you can produce corvettes on all your planets.

Next research translators and trade while you build corvettes.
:)You should try to keep your military rating to at least the middle of the pack. Don't look like the class wimp or you will get attacked! You may never actually fight a single battle, but you need a military deterence.

You might need to take the social slider down to zero to help boost you military production rate.

After you have trade, send out a couple of ships to trade with your nearst major race. You want to be in good with them because they are close by.

Try to get frigates as soon as possible. As soon as you do, switch from buiding corvettes to frigates.

Try and trade as many techs as you can with the minors. The majors don't trade too much at the early stage, but sometimes they are willing. Take whatever you can get because they will eventually get it anyway, so you might as well get something too.
Hope this helps!