First congrats..
Because the trend for nepalese getting selected thru DV has some cutoff.
Its upon you what you want to go for.
Fill DS-260 and show your intention what you want to do with your case after you are comfortable.
They will start processing 2018 from october 2017.
My case no was less than 7500 for DV2014. I was also worried what to do at that time.
I started very late since my cut off date was June or july 2014. I filled DS form and showed my intention FOR AOS around March 2014.
If you are confident that you will be going for AOS. Fill DS-260 form and wait till your case number becomes current on visa bulletin.
Then start searching medical doctor from USCIS website or medical test.
Pay DV fee...
Look for immigration forum ....