Getting started
Before you go for the Stargate, you should have reliable power generation ready at your base.
So for Survival worlds I really recommend you getting some Nether portal blocking mod (this for example) for a better experience.
- Build Orlin's gate,
- Go to the Nether with it,
- Gather enough Quartz and Naquadah,
- Go back to Overworld using the Earth's address.
BEWARE Ogre: Orlin's gate is only working for you to travel in and out. Two times. No more.
First, You'll need to get those diamonds. And go to Nether. And grab a shit-ton of Naquadah and Quartz.
Naquadah Ore is only found in The Nether
Each Naquadah Ore drops 5 - 8 Naquadah Shards(without fortune) With fortune add 0-2 per each level. The Stargate require about 3 stacks of those. Plus around the same amount of iron. Plus 2 stacks Nether Quarts. Pretty expensive, eh?
Next, you need to process it into Naquadah Alloys and Crystals. Use JEI for those.