You have a massive targeted audience here, you will have to narrow it further, otherwise the ad budget will be too big. In your case I would do some more positioning research for every group.
You can't just hire a person for 250USD per project, because there is so much long term work with performance tracking.
No matter who you choose, just keep in mind that you may find a person for one-time-job here but will spend much more on clicks in future. Hire a manager for a monthly service fee to track performance and keep leads running. You are not selling pizzas. Time between a click and a buy may be months
I am result oriented Adwords professional: no ROI - no pay. That's why I charge little more than average bid here. Terms and pricing to be negotiated after all info on task is revealed.
- How I work
1. Research (I need to understand your business, market, competitors and previous Adwords performance)
2. Strategy planning (for next 1-3 month)
3. Implementation (based on the research, I create new campaigns or change existing)
4. Optimisation (keeping only effective advertising channels)
If you are interested in my services, please answer with:
1. Site name,
2. 3 closest competitors,
3. Do you have goals set up in Adwords or/and Analytics for ROI metrics.