How do I say this in Cantonese? Thank you.
如果你知道一点英语，我可以帮你从一开始学习韩国
if you know english a little, I can help you learn Korean from the beginning

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如果你識少少英文嘅話，咁我就可以幫你由最基礎嘅韓文開始學起。

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sorry, my typo.. 如果你识少少英文o既话，我可以帮你由最基础开始学韩文。
It's not natural to use 韩语 in spoken Cantonese, we use 韩文 instead.

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In HK spoken language, we use "英文" instead. And in general Cantonese, "识得一啲英语" is same as  “识少少英文".  So you can also say it in this way.. "如果你识少少英文o既话，我可以帮你由最基础开始学韩语。"