A little off topic but the reason I even got a bearded dragon (besides loving them) was because my cat is getting older (like 10yrs? so much life still in her!) and I wanted another loving pet that would live long for when the time comes that she passes (huge downer, she is in no shape to be going anytime soon, just the thought destroys me.)
There is no set time frame on when you should or should not get more loving pets into your life! I'm glad you found another companion to love and put into a good home.
As far as feeding, there are already many great suggestions, but I thought I'd throw in one more that seems to work with my guys.
Main staple is dubias and BSFL for the youngest with occasional crickets in a pinch. I actually dust the container that holds the feeders (a cricket cage, essentially) before adding the bugs so that they just dust themselves by kicking around, however I only add enough bugs to feed off in a day or two.
When I do feed crickets, I actually remove the food bowl and place the dragon I'm feeding onto the floor of the enclosure and grab a handful (like 3-4) crickets and toss them against the inside wall of the enclosure, making them bounce off and basically stunning them for a moment, giving time for him to eat them up before they flip around like popping popcorn.
The stunning holds them in place, and the movement of them falling onto the enclosure floor triggers the movement/prey detector with the dragon and he reacts immediately (until full)
Never tried chilling them in the fridge.
Dubias suck at climbing, so putting them into a flatter bowl in the enclosure while you're away works really well. They cant get out and them kicking around trying could entice your beardie. I do this for when I'm at work and come back to an empty bowl