Hi there,
You can use something like this for the sum...
=SUMIF(H2:H10,">="&B1,O2:O10)
This assumes the data range goes from row 2 to 10, header row in row 1.
If you're using an actual Table, it could look like this...
=SUMIF(Table1[Date Fields],">="&B1,Table1[Sum Values])
Where you would need to change the Table name and column headers to match.
The count formula would look like this...
=COUNTIF(H2:H10,">"&B1)
or
=COUNTIF(Table1[Date Fields],">"&B1)
HTH