I don't know anything about your channel, so take this comment with a pinch of salt:
One of the keys to having a successful YouTube channel is consistency, and it is advisable to have a regular upload schedule. If you already have 3 videos that are ready to upload I would be inclined to upload them one at a time over a 3 week period. This approach will give your initial subscribers a sense that you are serious about what you do and worth staying with, and it will give you a 3 week period to work on your next videos.
If you have time and are ambitious enough you might even prefer to post your videos every other day over a one week period. The result will be the same, and you have a week to prepare your next three videos.
Hope this helps.