Advice for (half) marathon training

Hi everyone,

I'm new to this subreddit and wanted to check in because I need some advice.

Last march and april I ran my first two half marathons. Right know I don't have anything planed/no race I'm working towards. But I do want to set new goals and compete in a race in october. I'm still not sure if I want to go for a faster half marathon or if I would be able to train towards doing a marathon in october.

I ran the half marathons in 1 hour 57 minutes and 1 hour 52 minutes.

Right now I'm running three times a week:
- short run 50 minutes 9 or 9.something km
- Interval run 52 min 9 km
- Long run: since my last half marathon I kept running 17 km everytime. Fastest time in training was 1,5 hours. Lately I started to increase distance. Last week I ran 22 km.
On the days I do not run I do excersises for my hips and legs. I started this after having an overworked hip (before my first half marathon) and got these excersises from my physical therapist. I do the following excersises: lateral step down on stairs, single leg sit to stand, side leg raise, single leg bridge, reverse crunch. I do al of them in three sets of 10-15. In total it takes 20-30 min.

I havent trained on eating and drinking during a run. Right now I dont have gear to take stuff with me eather. To complicate things I have celiac disease, which means I cant eat anything that contains (traces of) gluten.

Could you please advice me on (one of) the following questions:

1. would it be possible for me to train towards a marathon beginning of october? Or should I focus on running a faster half marathon instead?
2. Advice on how to train towards goal
3. Advice on excersises/strenght training
4. Advice on warming up and cooling down
5. Advice on eating and drinking during long runs. Like I said I cant eat anything that contains gluten. I heared about gels, some sorts of candys and dried mango?
6. Nutrition overall for improvement of healing and running

I would really apreciate your help. Any tips are helpfull :)