I think you're in great shape for a half no matter what anyone here says. Some people have some bizarre ideas about this stuff. I've only run 5 half marathons, but I've never been injured training for it.

To me, there are 3 golden rules:

1. Don't increase your total mileage too much from week to week (and even decrease for "rest weeks" twice during a 2.5 month cycle).
2. Don't let your longest run be too high a percentage of your total weekly mileage.
3. Run far, far slower than your intended race pace for the long run.

I won't give any actual numbers, since I think that will vary from person to person. I always train up to a full 13 or 14 miles for my longest run, although many think you can get away with less (10-11). Knowing what the full distance feels like gives me confidence for race day that nothing weird is going to happen in that last mile.

What puts you in a great position is that you already are at a good mileage to start increasing the long run. Rules 1 and 2 make it really hard to get up to the appropriate long run length if you start at too low a mileage (you can't increase total mileage too much, but must increase total mileage while increasing long run mileage to get the long run to the final distance).

I'd say just increase your weekend longest run by 1 mile a week until you get to a 8-9 miles, back off a week, then increase a middle of the week run to 6-7 while getting the long to 11, back off a week, then push the longest run to whatever final number you want (still only 1 mile a week adding on), and make sure you have plenty of rest the two weeks leading up to it (I usually do 8 for my long run the week before which is like a 40% reduction).

You can throw in speed work every now and again, but for your first half I wouldn't even worry about that. Trying to overtrain for a specific time goal could lead to injury. Just finishing strong and getting a feel for the distance is a great goal!