You will find that most people recommend getting your cert with a minimal power H motor using single deployment to keep things simple. Beyond that, you have a choice to make concerning cases. The more common options in order of ease would be:
Aerotech DMS
CTI case
Aerotech case
None of the options are really hard, they simply require one to follow instructions. I would check with those who will be your whiteness to ensure they are familiar with your choice if it is other than the DMS.
Beyond that, you can go to
www.thrustcurve.org and out in the parameters of your rocket and get an idea of how high and fast it will go on a given motor. Keep in mind that small fast rockets the to easily go out of sight as well. But there have been people "cert in style" with fast high launches. Most have flown with electronics before and use tracking and/or dual deployment. Keep in mind, the more new things you are using, the more likely you are to end in a learning experience which leaves you without certification.
Kirk