Tip for getting the focus close -> use the moon, the focus for DSO won't usually be more than 2-3mm from this.
Then use the Live-View Zoom to get focus crispy at 10x and you should get reasonable results.
Exposure wise try 60secs at ISO1600 and work from there, lowering time to get round stars and increasing ISO to get what you want.
Next step is the angst of proper polar align and guiding
