I have found a couple of reviews of the Rolands, mainly from the 'hi fi' community but they seem very well thought of. They are of the closed back type and therefore probably more useful than open types.
However, you are getting the Adams and many will tell you that you cannot REALLY produce good mixes on headphones. But you need cans, for example, say you have a track recorded, guitar chords. You now want to add vocals on another track. You cannot have the speakers working playing the backing or else,
1) you will record the backing twice and horribly.
2) you could get screaming acoustic feedback.
So, look upon the headphones as a utility that allow such work. They can also be a 'microscope' allowing you to pick up tiny noises that might escape you on the monitors until it is too late. But, reproduction on speakers will give you a vastly better idea of the sound as it would be if you were playing all the parts, live in the room.
The Room. You need to absorb the sounds you make in same because ALL rooms sound horrible unless they are very large and even some bloody big ones do anyway! Classic setup for a mic in a bedroom is a duvet on a frame (clothes horse) i.e. behind the mic and a second duvet or thick blanket behind you. Thus you stop some sound getting away and some 'getting back'. Best to just setup the mic, sing or play then rig the treatment and I am sure you will see the beneficial effect.
Of course, proper room treatment goes much further. Most needing control is bass and that is done with large chunks of 'stuff' rockwool or fibreglass but most small room are in fact so bad in the bass that even very large bass 'traps' as they are called can do but little. MOST importantly listen to music through you monitors (and cans, a bit) and get an idea what commercial mixes of pieces of or close to your genre sound like.
I cannot really help you with the nuts&bolts of recording.Did some years ago and with son but well out of it now, just a mere retired OLD technician!
Check the stickies here and also
Sound On Sound | The World's Premier Music Recording Technology Magazine forum. You have a lot of reading and experimenting to do. I envy you!
Dave. (oh! and deaf with it)