If you have a local hobby shop there is a possibility they carry some rocket stuff. If not there is always EBAY or Amazon.
https://www.ebay.com/itm/NEW-Estes-...111091&hash=item5af0aa8a0a:g:jIsAAOSwVGFZspP8
take a piece of launch rod, slide it through one of the lugs on the Amazon, slide a piece of similarly sized lug over the other end of the rod, line the 2 up to be perfectly straight up the rocket and glue the new one in place (you may need to scratch up the rocket body just under where you want to place the new lug for it to stick well.) A small brush and some testers paint and you will never know
For your next build, any Estes skill level 2 kit will get you into the world of gluing fins on and prepping Balsa Wood to look good with paint on it.
https://www.ebay.com/itm/FLYING-MOD...506401&hash=item4b130b08f2:g:kIAAAOSwv0tVb6oa
Good luck and post up here, we all will be glad to provide tips and suggestions - I have been a member here for about a month and these guys are great!
And, welcome to the addiction - just wait until your first rocket goes up - Fire, , noise, speed, it is a great feeling