I agree with Bowmania!
No groups is you and only you.
If you are getting groups, just not on target that is tuning.
Tuning is a frustrating proposition if you aren't shooting decent groups already. Within several spine ranges, you will still be able to shoot groups, they just may not be on target.
For now forget trying to tune. Just shoot the arrows you have and work on your form. You'll know when you have progressed far enough that you need to tune.
And by the way, bare shaft is even tougher if you aren't already shooting good groups with fletched arrows.