Parkruns are great, sociable events. Don't worry about having to take a walking break - most of us do when we are starting out. Get out there and enjoy it. It can feel a little claustrophobic or self-indulgent if you have such a busy life and you are trying to fit in regular runs. Finding company to run with often helps with motivation and enjoyment. cehster RfL is perfectly achievable - you will be ready well before that!
I would check with your clubmates before buying. Our county league only has one course where you could just about get away with spikes. Good, aggressive fell shoes are more appropriate. Of course, if you are in one of the southern leagues running around parks, spikes should be fine.
I can't do it this year as I'm still not running following a minor car accident in December. I hope for your sake that they sort out the kit tents - sorting you into anticipated finish time may seem logical but it makes bottlenecks and queues inevitable - no fun in last year's conditions. My least favourate part of the course is the stadium horrible surface and too noisy for this rural runner. Best bits - the first climb and the stretch through the campus, drums under the road and the jelly baby station on the descent to the dual carriageway.