This situation has been thought about quite a bit by myself as I'm in that certain time period.
I would suggest flowering your first set of clones and leaving the original mothers from seeds as mother plants as long as you can.
I would only flower the mother after it was a space concern. I also suggest LST'ing the crap out of your plant, topping (FIM), and/or planting your plant sideways in a tub if height is an issue.
The reason I say this, is that, your seed-grown mother has a developed root system and can take the lost of the limbs of the plant a lot better than clones. (basically a mature plant)
But back to the point, By flowering the mothers, yes, you're going to get weed faster, but it will set you back in the long run.
You'll need to wait for the clones to grow to a size that you can remove clones from them, then wait for the clones of the clones to bud.
Not to mention you also endanger the possibility of loosing your entire crop by relying on a clone to survive unforeseen diseases, bugs, etc.
If you can wait a lil bit longer it will be well worth it. You'll be rewarded with a then constant supply of buds
.
A friend once told me that the first 6 months are the worse.
How true is that?