I would suggest utilizing Upwork.com for finding an expert. This site will allow you to create a detailed project proposal based on your needs and give you maximum flexibility to create a payment structure that fits your budget. Depending on how the training is structured, you can pay the expert you choose either by the hour or session. Holding online training seminars with multiple individuals would be the most economical and effective way to accomplish your goals, then if needed, you can find another expert with at a lower rate to help answer further questions the attendees might have at on later date. This task could be performed at an hourly rate, as the bloggers would most likely need about 30 minutes of time to reinforce concepts learned during the seminar
I would suggest Upwork or Guru for smaller projects, especially around training.
Just make sure that you look at the material from the trainers and get a good feel for what they do and how they do it. I would also encourage staying within your time zone, that will also likely provide talent that has better English and can work on your schedule.
Ask potential freelancers to provide a short video or audio with a 30 second training. This will show you the way they teach and their style. This should help you make a better decision to find the right partner.
If you are looking for SEO trainer you can go on an online platform. You can check out this link: https://www.simplilearn.com/digital-marketing/search-engine-optimization-seo-certification-training
But if you are looking for human interaction you can use this link: https://www.urbanpro.com/delhi/seo-training-classes
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath