Hello Imonlyhooma
I welcome you here to EBR and to the Juiced Bike community. I hope you will enjoy the RipCurrent as much as I am.
So . . . on to you questions. I take it from your post that you have the RipCurrent. The RipCurrent S comes with the rear rack as standard equipment. You would have to order the rear rack separately with the base RipCurrent. The rear light/reflector. would be installed on the rear rack on what looks like a licence plate holder, see the attached photo. There are three nuts in the poly bag, the two smaller ones are for the light. OK, for those who look closely, YES, I know, it's installed upside down. Well, I don't know, I guess it depends on how you look at it . . .Yes! Maybe I have some Australian blood in me?
The two rods that you have are spare spokes for the bike. Included in the poly bag you should find two nipples that are for the spokes as well. Juiced started including them because of an issue with broken spokes in the past. Juiced has corrected that problem with new spokes from a different manufacture on all current bikes. Also some people were having problems with some local bike shops not carrying the correct length spokes. So, a good item to have just in case.
The square clear reflector is meant to install on the handlebar facing forward and the red one on the seat post facing the back. Your base RipCurrent should include the front 1050 lumen headlight. The reflector is an additional safety item if you ride without turning on the headlight. It's up to you if you want to install it.
The two clear oval reflectors are meant to be installed in between the spokes of your front and read wheels, see the attached photo. Another safety item, and I believe in some states a requirement for side visibility.
Well, I hope that helps clear up you questions. Now . . . get out there and start cycling !!