Newcomer to Central Florida

[Edepro53]

I am a newcomer to Central Florida and am looking for a reliable and not very expensive provider of a good mix to fill my 4 beds (4 'x 8' x 1 '). I want to grow vegetables organically. I opted for raised beds because of the very sandy soil and I understand that with nematode problems. So the raised bed theme is also relatively new to me. I would greatly appreciate any information regarding suppliers and recommendations to minimize initial errors.
Thank you in advance.