bennychico11 hit the nail on the head.
Simply panning mono source material creates a "Dual mono" recording. Stereo depth (3D stuff) is created with phase differences between the two channels, usually created by microphone placement, or delay. Stereo Reverb can 'diffuse' audio into stereo by modulating delay times slightly in each output channel, and inserting small random changes to reverb parameters differently in each channel, over time.
With mono source material, you can start by adding more reverb. But don't add too much!!! Too much reverb will rob you of that great raw sound you have right now. Too many of todays recordings are so washed out, we are conditioned to expect overly long reverb trails on everything.
If you don't have access to great reverb, and many people don't, try playing back tracks you want to add reverb to out of speakers in a large room, and place microphones in the middle, and the farthest point from the speakers, effectively creating a reverb room. Record these mics to separate tracks, and play with the levels and panning. A stairwell, long hall, gym, bathroom - try em all!
If you want an extreme 3d effect, mult a signal into two channels on your mixing equipment (that is, make the same audio appear in two channels). Invert the polarity (phase) on one channel, and pan them hard. Anyone listening in mono will completely miss this sound (because it will cancel), but anyone else will hear sound which appears to go 'through' them, or from behind. This works great on subliminal vocals. ;-)
Multing signal to two channels, and adding slight delay (on the order of 1 to 50ms) can also work good (and then add some panning).
Also, to make things sound bigger, sometimes I mult the signal to two or three channels, and apply completely different EQ and dynamics effects to each one, and pan them around the stereo field.
When recording a source such as acoustic guitar, Mid-Side micing can produce exaggerated 3d results, if the side mic's channels are pushed higher into the mix than the middle mic.
Doubling tracks (that is, recording two or three vocals, guitars, etc, played as identically as possible) can also thicken a stereo image. I had a track with three identical vocals once (but separate takes). For the most part, I used the track I felt had the best take, panned into the center. But for certain words, and on the chorus, I'd push the other two into the mix heavy, and panned hard left and right.
Your recording as it stands sounds great, btw, so keep up the great work.
Just think about what is involved in a 3D image. Width, height and depth. Which are associated with panning, volume, and a time delay of somesort. Your recording sounds good, however I think the vocals are too far back. The guitars over power them a lot. This might help you with accomplishing the 3D image since the vocals are more centered. Bring them up in the mix (or the guitars down) and make them more in your face (less reverb will help). It sounds pretty good though. It also seems you might have used a lot of gain makeup during compression??? I dont know...it's weird because the normal level I listen to music at is too loud for my ears when I play this song. This isn't necessarily a bad or good thing. Just something I noticed. Nice job though. 
