I'm pretty much in the same place as OP. It's time to upgrade so that I can use my DSLR with my telescope. I've read that I need a T ring and a T adapter. I found this adapter kit online which seems like it fits my camera and scope. I've ordered it and I should have it on Thursday. I'll try to remember to post my experiences once it arrives.
Sure - Deluxe Telescope Camera Adapter Kit for Canon EOS /Rebel DSLR - 1.25" Variable Eyepiece Projection & Prime Focus https://www.amazon.com/dp/B0053ZJW5G/
Thank you. I use this