What Horemvore said. I highly recommend getting Interstellar Republic ASAP.
Also, you should get your morale up:
- You can set your tax rate to 0 in the beginning. It doesn't really matter, you will be at a deficit for the first 50 - 100 turns anyway. Get money from anomalies and treasure hunt missions to compensate. This works pretty much indefinitely. You can also sell tech and resources at the market or to the AI.
- Build morale improvements and ideology buildings (Intimidation Center is best) on your planets early.
- Research Supportive Population and Easy to Please
- Use the 2 Celebrities you get for free (for researching techs) on your HW or other key planet