I hiked a ton and cycled before I got into running, so these things made for an easy transition.
I think being such an experienced hiker (5000+ miles on my legs) before getting into running gave me a really strong skeletal-muscular base and is one of the main reasons I've never had a running injury in the 10+ years I've been running regularly.
In the winter in Western Massachusetts, I used running as transportation from about age 12 because you can't really ride bikes in the snow and ice. 2 miles to my friend Andy's house and back in "snow mobiler's" boots. The motivation? He had the best Marvel Comics collection, near complete runs of Spiderman and Fantastic Four! Well worth the slog.
From there, joined the track team as a freshman, Mr. Winseck made us run intervals. It was hell, my stomach hurt. I was going to quit, but I won the JV time trial in the mile and made the team. It was worth the awful pain if I could win races, I figured.
Idk man, I didn't have much of a struggle with motivation when I started running. It was sort of the opposite actually and I tried piling on too much too fast. Why are you starting to run? Health or social reasons?
Made a commitment to run every day and succeeded because
-I had saved up enough money to buy a new pair of Nike Cortez shoes, first pair of shoes I ever bought by/for myself
-wanted to race xc better
-went out to run at the same time every day
-was inspired by '72 Olympics
-ran by feel and mainly just easy distance covering 3 to 5 mile loops I knew
-the physical part was easy as I was a young teenager that was already active and fit
-there was a mental struggle as I lacked self confidence and feared what other people would think or do seeing a runner (there were very few other runners where I lived and I ran alone). I did the same loops combining parks, trails, etc. where I encountered few other people until confidence grew.
-there was a mental struggle to get out and run every day until it became a habit.
It was a million years ago but I enjoyed exploring every single road, field, and patch of woods in my area. I also challenged myself in middle school and eventually ran to school every day. I started with around the block (half mile) then twice around before the bus got there. Eventually I worked up to the full 5.5 miles. I also build in a day or two off every week. However you do it, have fun and good luck!