Advice for setting running goals for a beginner

Hi everyone! I need some advice as I just started running. 

I started with the c25k app but felt ok running longer than one minute, so I ended up running 15 min straight for day 1, then 25 min yesterday for day 2 (although I wanted to stop so bad at 20 min). I average 11:20 min/mile which is reaaaally slow, but I'm not too concerned about it.

I don't really know if I should keep up with that 25 min or try and reach 30 or even 45 min. I don't want to set myself up for failure by having unrealistic goals. My main problem with keeping up with an exercise routine is when I feel overwhelmed/demotivated. My legs are fine/aren't sore at all today.

I want to run 5x times a week, for weight loss mostly, as I am 35 lbs overweight (10 lbs overweight BMI-wise). 

I guess my question is, what are realistic goals for someone who starts running? Should I work on running for a longer period of time? Faster? At what frequency should I increase my goals and by how much?

Also, I'm currently eating anywhere between 1200-1600 calories a day (BMR is 1630). Is that enough for running 5x a week? I'm aiming for a 1.5 lbs-2 lbs loss a week.

tia :) 

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