Do planeswalker's abilities kick off the heroic ability
No. A Planeswalker ability is an activated ability and not a separate spell.
That's what I thought I just was hoping I was wrong to benefit a deck of mine lol but thank you guys
Does the heroic ability (such as adding a *1/+1 counter) get negated at the end of your turn? Would the counters leave the creature?
The counters stay at the end of the turn, unless stated otherwise.