Um, I actually bought some stuff that didn't come with the telescope.
These lenses among other stuff.
Explore Scientific 62° Series 5.5mm Waterproof Eyepiece - $149
Explore Scientific 68° Series 24mm Eyepiece - $269
Explore Scientific 68° Series 40mm Waterproof Eyepiece - $519
OK, Let's back up for a moment.
You started this thread on the 24th of October. So you have had about three weeks of considering your scope and hopefully trying to use it. How is that going? Have you made any progress? What have you seen? Have your tried the goto functions of your scope?
The selection of eyepieces you have above are very nice. You will use the 40 and 24 far more than the 5.5. Until you have the goto/tracking functioning the 5.5 will frustrate you. With your scope it gives about 360X which is a magnification you may be able to use only on the rarest of occasions and then on the moon and planets, maybe. So set it aside as a curiosity for the time being. The other two will serve you fine.
Where are you located? It is likely that help is nearby.
An 8" SCT is a wonderful telescope with which to start. A great many here have done just that. So what progress have you made?