What to do with points?

Make an account, level it up, then you can buy the membership.
There is no really restriction in it, its just you're gonna get bullied because of low-level yet premium member. still your decision, just a suggestion.

I did the same thing. I got a new account and Upgraded it from level 1. Farming is a breeze because you have access to some good Legend classes as well as /honorhall and /nightmare to farm easy CP, gold, and EXP. Rep farming is much less grindy and daily quests are everywhere. There's legend-only stroylines and shortcuts. YOu might enjoy the game since it does have a lot of storyline lore to get through over the years.

Get the 12-month membership + 7000AC, and add 5000 extra AC for 5 more dollars. Good deal. Or, if you want more AC's and less membership, then get the 3 month + 6000 AC for 24.95, and spend the rest on the 12000 AC pakcga because you get an extra 6000 for free.

Assuming MQ and DF aren't getting updated anytime soon, go for AQW.
Btw, any way to get those points for cheap?

I did AExtras and used a vcc with a small amount of funds authorized on them. I had to take screenshots for every single offer, organize them in a "you can't refute the fact that I did this offer", and literally spent real money (like $1 or so each offer), and even then, they tried to argue with me. There is no known exploit for points, you just have to do offers if you really want a substantial amount. The thing is, they denied me multiple times before even giving me the points. It was incessantly annoying. You also have to word it a certain way if you want them to accept it, so not sure I'd recommend. But it did beat spending real life money. I only spent ~$5 vs the $105 it would have taken to buy all those points.

How long did it take?

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To get all those points

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I swear the last time I looked at those AExtras BS I just got a bunch of scams and then gave up