One big difference to tables in Calc or Writer is the necessity to define types for the columns of the Table and ALL rows have to obey this constraint.
So: Create a new database first, then in the tables pane you can define a new table.
To be able to edit the table you need a column with an unique key/id. A common approach is to have an Id column with an autoincremented value.
However I would copy the contents of the table to a new spreadsheet first and replace the pictures by the filenames of saved pictures.
If you have columns containing date and/or time you should think about the right format to store this in your database. The conversion may be done in Calc. The Id can be left empty.
After everything seems right you mark the whole table, copy to clipboard, select the Destination table in base and select paste from the context-menu. In the opening dialog you choose to append to the existing table and can then even select the imported columns.
The last big step(s) is creating forms for editing the table.
This is only a rough outline. Don’t underestimate this step. And, if you need access to your data by several people/computers you may need to install another database like mysql first, as the internal HSQLDB is not for multiuser-access at the same time…