This thread's title is "Help.....", so let's take that to heart and give the OP some helpful advice.
My 'Top Tip':
Spend some time browsing the material in the Tasker Wiki
. I used this walkthrough
to build my own profile to accomplish #1, then found examples elsewhere on the site that let me switch wifi on or off dependant on location determined by cell tower and/or GPS location.
I'm one of those people who finds it much easier to learn stuff by deconstructing it, so once I saw how a simple profile worked I was off and running.