I want to learn English but I don't know the best way to go about it, so I hope you can give me some suggestions.

我想学英语，但我不知道怎么样学最好，所以我想请你给我一些建议。

youdao

Don't push for an interview on the spot, but rather explain that you want to let them know of your interest.

这个时候不要急着想去面试，要解释你想让他们知道你的兴趣所在。

youdao

I want him back, but I just don't know how to go about it.

我希望他回来，可我就是不知道怎么去做这件事。

《柯林斯英汉双解大词典》

Let us say I want to sell my car but I do not know exactly how much it is worth.

VOA: special.2009.04.12

But if you want to know the answer, and I knew it, but I forget what it is-- it doesn't matter.

如果你想知道答案,我曾经是知道答案的,不过我忘掉了,这不重要

耶鲁公开课 - 心理学导论课程节选

Well, probably you want to know some of it but you might not want to know all of it right?

可能你只希望知道其中一些,而不想全部都知道

耶鲁公开课 - 生物医学工程探索课程节选

But want to know if an unfamiliar product say a polo shirt with a three-quarter length sleeve will work in a virgin market?

FORBES: How To Create What You Want In An Uncertain World

Though she teased on Twitter earlier today that she'll, "still be making stuff, too, " and not to worry, she wouldn't offer us any more details about her plans for development on OUYA. Again, it seems a given, but we can't help but want to know more sooner than later.

ENGADGET

"I'm not opposed to this necessarily, but I want to know more, and I'm going to be a lot more cautious this time around, " he said.

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