How do I approach this?

So I've been noticing a need for affordable childcare especially for single parents. I've been a single parent for most of my children's childhood so I understand the struggle. I was lucky enough to have a close extended family that jumped in to help whenever possible. I absolutely love kids and would love to help out some single parents in my area with childcare. My question is how do I advertise without looking like a creep. I obviously want to only charge what someone can afford to pay or would even take things like a homemade loaf of bread etc. Ive offered this to friends in the past and its been fun and helpful for them. I don't have any childcare qualifications other than babysitting. But I do have a CNA license and prenursing. I have a sweet sleep overnight position currently, and the semester off so I basically have a lot of free time to do this. Anyone have ideas on how I could offer this service respectful?