In the end the game has two main objectives. One is the actual main story, which is about what happened to MC's dad and that part will finish the next update(s), probably in september or so. The other part is to find a date for you prom, and completing that and the rest of the game will take a lot of time. It's reasonable to assume that the game is not even 50% done right now (the official tracker says 56%, but it doesn't include reworks) and that it'll take another ~4 years until one could consider it done.
Having said that, once the main story is finished it's probably a good time to give it a go again. The game has changed a lot in those last years.
You mean a walkthrough?
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which should answer all your questions.
And yes, somebody should really clean out these old walkthroughs from that walkthrough threat. They are more than 2 years old and completely useless by now.
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All they do is cause confusion.