There's a lot to unpack in that paragraph. Let's break it down and start with ONE thing at a time. What are you trying to accomplish first?

Hi there, First thing i want to search the data from one form and load it into unbound controls in the another form

There are a number of ways you could do this, I'm going to use DLOOKUP.

So let's say you search the field in SearchF, your other form is UnboundF for this example, and you are searching by the SerialNumber which is the unique primary key in the table. Then you want to send over the Serial Number, a Product Number, and a Description.

Depending what kind of search you have will change how you dlookup values below. For my example, I'm going to assume that I'm searching by the SerialNumber so I will have it, if you're using a listbox or some other search you will need to make adjustments.

DoCmd.OpenForm "UnboundF"
Forms!UnboundF!UnboundSerialNumber = SerialNumber
Forms!UnboundF!UnboundProductNumber = DLOOKUP("ProductNumber","ProductT","SerialNumber=" & SerialNumber)
Forms!UnboundF!UnboundDescription = DLOOKUP("Description","ProductT","SerialNumber=" & SerialNumber)

Listbox Search you could use = SearchList.Column() and appropriate numbers

You could also use a recordset

There are a lot of ways to do it, including what Adam said. You'll definitely need an event to trigger loading the data. See AfterUpdate.