I was just wondering if I could get some advice and tips on how to make good nsfw, 18+ anime pics, im new to this stuff and would like to get into it for fun. Can anyone help?
I can't be sure where you are in the process so here are some guides to get you started:
Note that the guide already expects you to have a pretty good GPU but you can make good (if not that hi-res) images with a comparatively shit one. There are a lot more guides for all kinds of aspects on civit.
The baseline though is: select the kind of checkpoint and other models that strikes your fancy (MeinaMix or Hassaku for example)
Use a (small) selection of negative prompts and positive prompts for quality. ((worst quality, low quality:1.4) and masterpiece, high quality respectively) and from that point it is all about experimenting with prompts. In that case any danbooru tag with a non-neglibable presence can work Tag Groups Wiki | Danbooru (donmai.us)
Sexual content with 2 or more characters in particular is less likely to work well with just the base checkpoints. That's what LoRAs are for.
Basically try whether you can get what you want, if it is too inconsistent or doesn't work start searching civit for a fitting extra model.
The same goes for specific characters and more specific artstyles. A few actually work with nothing but the danbooru tag, but for consistency you want corresponding models -> Ratatatat74 - Artist Style - pruned | Stable Diffusion LyCORIS | Civitai
Making "good" nsfw will always require some testing and experimentation. I'd recommend to keep the prompting to a minimum and work up from there.