You are on the correct start. If you have dynamic information to display on your page you will need to make use of the recordsets to show this info. Once you have crafted the recordsets you can then drag and drop the bindings onto the page where you would like to see the info for that record.
As for recording info in your this will be done with either updates or inserts into your tables. You can use the DataAssist Insert and Update server behaviors for this. It is very straight forward, when you apply either an insert or an update to the page it will guide you through the setup. You will select the table and fill in various values along the way. You will get to a page that shows the columns for that particular table, on this page you set the values that you would like to insert or update the table with. If the value is dynamic like the comments input you would use the lightning bolt icon to select the form element for comments.
If you have not done so already you should check out the DataAssist Support page by visiting the support section of our site. The getting started guide should cover this info and more.