I pretty much agree with Len.
I think a very significant problem in our society is that we try to take things down to a one-size-fits-all, give me "the" right answer, if-I-do-just-this-one-thing-everything-will-be-perfect attitude.
* Heel striking has gotten SO much attention. What matters is the short strides. It so happens that the longer your stride the more pronounced the heel strike. So what do people focus on? The heel strike. "Heel striking is bad." Well - not necessarily. LONG STRIDES are bad. And even that may be wrong. In reality HAVING YOUR FOOT ON THE GROUND TOO LONG may be bad. (There is natural elasticity in your tendons and ligaments and if your foot is on the ground too long you don't give those tissues the opportunity to "bounce back" as they naturally can - returning energy to your stride. You can kind of feel it yourself: try running in place with a slow cadence. Then run in place with a fast cadence - having your feet hit the ground ~180 times per minute. The fast cadence likely feels easier.)
* Don't be focused too much on the heel-toe drop. Again - people get really fixated on something measurable. "If going from 12mm to 8mm is good, then going to 4mm must be better and 0mm must be fantastic." I think it is better to have a relatively lower heel. It enables you to take advantage of that springiness I described previously.
I massively agree with Len's comments about running upright, leaning from the ankles, etc.
For now just focus on getting into a routine. (i.e. what do you need to do in your life and life schedule to ensure you go out consistently? Are you able to do it consistently? I think for many our brains can only handle so much at one time. If going out is new to you and, when you do so, you're also trying to process all the form questions you do - it could just be overwhelming.)
Good luck!
Jim