Hey Vivek, they're great for a first attempt.
You will find it quite difficult with a high magnification eyepiece, especially with the large lens attached to a DSLR. You'll get lots of vignetting, and with cheaper plossls, the images won't be sharp near the edge of the field.
Full moon shots with a lower-power eyepiece are much easier, as you've found. The second shot is a great one.
You can get better at afocal stuff.. for example, sitting the camera on a tripod instead of hand-holding, or getting an afocal adapter bracket which will hold the camera onto the eyepiece.
Ultimately though, you will be limited with what you can do with a DSLR and a dob. I wouldn't bother with T-Ring and adapter yet - you'll most likely find that the DSLR won't come to focus at prime focus, due to not enough in-travel. You'd need to get a very low profile focuser, or move the mirror up the tube. It's discussed here in this article:
Modifying a newtonian for DSLR Photography.
So you might just want to keep playing with afocal until you get an EQ mount - then you can worry about those things.
You can try a webcam like a ToUcam with your dob - it will give you better high-magnification images of parts of the moon, but it's a lot of work and is a whole new ballgame.
Good luck and keep trying!