Hello Isaac-san!
Welcome to the forums and the language!
Well, actually, there is not exactly a "Point" to start in my opinion, simply because learning japanese in speech and writing is a pretty broad task - the writing, the language, the grammatic, the vocabulary - there's a lot to tackle, and since it's all connected pretty deep, you can't learn one thing first and then the others.
So, I always recommend to approach slowly, but in it's entirety. A lot of things won't make much sense in the beginning, but they will later on, when you covered some ground and start to get a broader view into the language.
So, just learn away!
Anyway, there are two tipps I like to give newcomers and which I always think helpful.
1. Whatever you do: Start with the kana! Bevor you start learning any vocabulary, any language, any grammatical point, memorize the two japanese alphabets, especially the hiragana. The earlier you learn to leave romaji (roman letters) behind and using japanise syllables, the better, and it makes understanding the grammatical point, the reading, and the logic of the language MUCH easier! So - before even starting with lesson 1 - learn the Kana.
And also: Stick to them! No matter what! Whenever reading or writing japanese: Use kana. It's hard and unused at first, but you'll use them a lot while learning, and very soon you'll use them like your own alphabet!
2. Learn broadly. Not just the content, but your tools too. I think it best, to test and try whatevers out there: Textbooks, tools, Websites - every adult person learns japanese best by another way, and so there are many ways out there. Try finding which ones best for you. I took a standard textbook for the grammatic, later on expanding that to more spezific books explaining only verbs, adverbs or connections. I learned the Kana and Kanji with the much discussed Heisig method of mnenomics. And I use this wonderful website for expanding my listening comprehension, building up my vocabulary and this great forum.
So, don't stick to just one tool, try them all out and use what's working best for you.
And some extra tipp:
3. Keep going and keep it fun!!
It's not an easy task, especially the first weeks and months will be filled with frustration, not understanding, and selfdoubt. But the longer you keep at it, the more you'll start understanding all the stuff you couldn't wrap your mind around at first. But for keeping at it, you'll need to keep it fun! If somethings too hard - get back to something simpler. And never expect any quick progress, especially in the beginning - it's slow, really slow, and it'll speed up eventually, but only in the long term!
Have fun!
Best
くろくま