I haven't used it in a while but OneTrainer [1] used to be the "industry standard" for a solid LoRA trainer you can use locally - though a lot of people use CivitAI's LoRA training tools online [2] as well.
Biggest tip I can give is that more images is not necessarily better, rather the most important thing is that you caption/tag the images well so the LoRA learns the right "concepts".