Forasmuch as the fugue is by any measure an advanced counterpoint technique, it helps to have at least a little background in the art of counterpoint before you attempt one. Starting out trying to write a fugue is a bit like trying to ride a motorcycle when you've never ridden a tricycle before.
Now that I've gotten that out of my system, the answer to your question is: no, you're not on track...but you're close, and what you've got is pretty cool. It just needs to follow some rules in order to be what you'd like it to be.
Not all imitative counterpoint qualifies as a fugue. What you've begun with is a canon at the octave, then when the third voice enters you don't follow suit. In order for this to be a fugue, the second voice must enter in the dominant (G minor in this case), or less commonly in the subdominant (F minor); then the third voice enters in the tonic again (C minor); if there were a fourth voice, it would enter in the dominant or subdominant again, 5th voice tonic, etc.
I started a little fugue using your subject, slightly altered at the end (that last octave jump isn't advisable...makes all kinds of things tricky, especially in a keyboard fugue, which this seems to be). If you'd like to see what I did, go
HERE; I'd have posted a jpeg, but for some reason YC's system keeps wanting to shrink it down to a thumbnail almost. Notice how the second voice enters in the dominant, though I chose to change the first interval by one degree of the scale, which is permitted and is called a "harmonic" statement of the subject; I chose to put it in the bass because this subject is just rangy enough to need some space between the parts, and just transposing what you had in the second voice up would have created collisions. Then the third voice enters between the other two in the tonic. I tried to preserve some of what made your treatment so interesting, like the upward scale in the first voice during the second voice's statement, though I did it a step lower.
Now you don't have to do what I did, but you do need to follow the tonic statement/dominant answer rule.
Check out the link, and if you need some other pointers, here's a link to my article here on YC, kind of a crash course in writing fugues:
A Crash-Course In Writing Fugues
Good luck, and good work.