How do I go about determining what to offer and what figure is fair?

You will meet people from different walks of life that will give you different perspectives on real estate investing.

They offer free webinars pretty regularly so I recommend you check it out. https://www.baselane.com/

I have a property I would like to sell:-Market value: 450,000-Purchased in 2020- Mortgage has $153k left at 4% (conventional)The market is slowing down a bit and since I no longer would qualify for conventional loans, I am considering offering seller financing to generate some interest and get the best sale price.I would love some ideas of how to structure this properly. 

The key is knowing what type of traveler is looking for the type of property you're offering in the location you're in.

Making an offer on another 89 acres.  

We are having a great time connecting, getting to know each other, sharing our properties, asking questions and offering advice and resources.

In my network, capital partners are offering $500k match for match. 

On market deals are tough, but there are great deals on the MLS and you also do not have to offer what is listed - if you see a property that works out with a lower offer price, you can simply put in an offer.

When interviewing brokers, you can confirm the technology brokers offer for market research and property evaluation.