How much DRK to run a masternode? 1000?
yes, 20% of block
Do I need 1k by a certain date?
No, however long it takes to accumulate 1k DRK. After that, you can run a MN.
You can run one today if you feel like it too. This is only the "payments" going into effect. Masternodes have been humming along all this time.