Welcome. I arrived here from traditional archery as well. The two compliment each other. Interestingly, I shoot my bows "instinctively" and my slingshots with a reference point.
While you are waiting for those forks to dry and for your Ranger to arrive, keep in mind that you can always put together a Wally World special. Go to the closest Wally World and purchase a Daisy F-16, flat exercise bands, Daisy steel shot, marbles, paintballs (or all three!), rubber-bands, heavy fabric, duct tape, and a rotary fabric cutter. Put a couple of strips of duct take on the fabric to make a pouch. Use the rotary cutter to cut the flat exercise bands into 3/4 inch strips and use the rubber-bands to tie on your pouch. Cut off the tubular bands. Use the rubber-bands to wrap and tuck the flat bands to the frame - and.... voila! You have yourself a decent shooter. Lots of information here on modifying Daisy F-16s.
You can also find paracord there to make a wrist lanyard. Don't forget your safety glasses!
Have fun. Looking forward to reading your posts.