Hello! I also recommend using a popular tag for your first one. Then look at the trending tags and choose accordingly, forexample your first post could be a collaboration of all your interest. Such as, introduceyourself steemit program newbie therearefourtags<---the last one should always be silly or random in my opinion. :) Pay attention when reading other peoples post and see what they tag and add accordingly. :) Let me know if you have any more questions. I would also recommend following @minnowuniversity blog. WE post helpful information on there too.