I found a similar solution to this question in c# How to Select all the cells in a worksheet in Excel.Range object of c#?
What is the process to do this in VBA?
I would recommend recording a macro, like found in this post;
Excel VBA macro to filter records
But if you are looking to find the end of your data and not the end of the workbook necessary, if there are not empty cells between the beginning and end of your data, I often use something like this;
R = 1
Do While Not IsEmpty(Sheets("Sheet1").Cells(R, 1))
R = R + 1
Loop
Range("A5:A" & R).Select 'This will give you a specific selection
You are left with R = to the number of the row after your data ends. This could be used for the column as well, and then you could use something like Cells(C , R).Select, if you made C the column representation.