I'm a small business in florida and I resale some toys, but I paid sales tax (never used my resale certificate), what should I report in my sales and use tax form?

The fact that you paid sales taxes on your inventory has nothing to do with the sales taxes you collect on the sales you make to others ... you collected the sales tax and it must be remitted to the state.  Call them if you don't understand how to complete the monthly remittance forms. 

What you should have done was to use your resale certificate to avoid paying sales tax on the products that you purchased for resale. That's what you got the certificate for. You can't fudge your sales and use tax reporting to make up for not having used the resale certificate.

Are you selling only to customers in Florida, or are you selling to other states as well? Sales tax is determined by where the product is delivered, not where the seller is located. If you are selling to customers in other states, you may be obligated to collect sales tax for each state that you ship products to, and to remit the appropriate tax to each state. You do not collect or remit Florida sales tax on sales that you ship to other states.

Sales tax for interstate sales is very complicated. There are services or software available to determine the sales tax rate for a specific delivery address. If Facebook Marketplace is "charging" sales tax, they may be doing this for you, and they might have additional services to help you deal with sales tax.

This TurboTax community is for income tax questions, not sales tax. We have given you some basic information, but you will have to look elsewhere for more detailed help with sales tax.