If you're a beginner, the easiest way is to use KRITA. It's completely free, but you need an NVIDIA RTX graphics card.
You can download it here:
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I found a tutorial, but it's in Spanish. You can also watch it with English subtitles:
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You can download the LORAS from CIVITAI.
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You'll need to download a model for Stable Diffusion. You can start with PONY DIFFUSION V6 XL:
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And you'll gradually learn.
If you want the Boy Hero Ken LORA, I have some I made, but they're not very good because they're just tests.
Everything's free, as long as you do everything locally with an RTX graphics card.