you may get a few good knots goin' if you start neglecting now, but to me it seems you my need a bit more length to develop ropes. Check out the FAQ located in the Sticky: Read this or...
Dude. Did you reverse the gravity in your room? If you get dreads, they'll go upwards, towards the sky...
Kinda hard to tell from the photo, best thing you can do is measure it (if it's not all the same length measure the shortest part, unless you're ok with only part of your hair being dreaded up while you wait for it to catch up ). 5-7 inches is minimum usually recommended, I started with a little over 4 inches and it worked fine for me but my hair is very dry from bleaching which I think helps. Bear in mind as well that they may shrink, so you could end up with pretty short hair.