Can you change the selection of eyepieces to say a 25mm and a 15mm? The Orion Shorty Plus will effectively give you four different eyepieces with this combination.
If you are starting from scratch then the must haves are planisphere, red torch, observing chair (or you will get dobbers back), cheshire eyepiece, pair of binoculars and a cardboard box to carry it all in
The Telrad would fall into the nice to have bracket as the scope will have a functional finder scope on it already and your money would be better spent on the essentials. Another nice to have is a pair of speaker magnets with a thin felt covering to help with balancing issues but these can wait as well.
In the beginning just enjoy the scope and buy slowly and wisely.
Cheers