Fugue in C Minor (string quartet) .7

So, this is my very first go at any serious counterpoint... actually, I tried to write a fugue once based on this same theme and failed miserably. So, maybe better to say that this is my first go at serious counterpoint to be (possibly?) successful.

I figured since I really don't know hardly anything about writing a fugue except that all the voices come in on the same theme, you can have a countertheme, and there are these things called episodes (whatever they do, lol), that I should maybe ask how it's going so far and get a few pointers. I have tried to focus on giving each line, taken individually, a coherent melody. I know that's like "duh, you're writing counterpoint, that's what counterpoint IS" but I've been more successful in some places than others.

So far I have a theme & countertheme, both introduced by exposition (with the countertheme it's not a full exposition) and I'm about to develop them a bit, combine them together in major, and then play around some more and combine them in minor and end (it's just the main theme that changes mode, the countertheme is always major). This is supposed to be a movement in a string quartet, we'll see how it goes. The rest of string quartet (that I have written somewhere or other) is in e minor, so I might have some transposing to do.