Team Averages and Frequency Help

Hello

I'm new to Power BI so please forgive me if I'm a little oblivious. Also I apologise but due to the nature of the work I am unable to share any direct data and have had to alter some of the information below to anonymise things. If I have done too poor a job of explaining the situation and outcomes required I will get to work putting together a mock sample for anyone who can spare some time.

I have a spreadsheet of worklogs submitted by staff from two different teams with over 5000 entries each month. I am trying to create a line and stacked column chart that will show the number of worklogs submitted each day with a line for the daily average and adding a slicer to filter through the different members of staff who have made a submission. Something similar to the below:

I currently have 3 tables set up:

- Team Worklog Data - CSV data of all the worklog submissions, 5000+ rows, 15 columns including names, dates and type of work. I have added a calculated column in here to display team name of the user for other purposes.

- Staff List - list of all staff who use the worklog and the corresponding team they work for

- Count of Worklogs - table with caluclated columns to get a daily breakdown of the worklogs submitted

Calculated column1 = 

Daily Worklog Count = SUMMARIZECOLUMNS(
                                  'Team Worklog Data'[date created],
                                   "Daily Worklog Count",count('Team Worklog Data'[workcompleted])
                                     )

Calculated column2 =

Average Daily Worklog Count = 'Count of worklogs'[Daily Worklog Count]/(calculate(countrows('Staff List'),filter('Staff List', 'Staff List'[Team]="Team 1")))

The measures I'm using for this are:

" Total Work = Count('Table1' [workcompleted]) "

Column Values: " Team1 Total work = calculate([total work], 'Table1'[TeamNo]="Team1") "

Line Values: " Average Daily Worklog Count = 'Count of Daily Worklogs'[Total Daily Count]/(calculate(countrows('Staff List'),filter('Staff List', 'Staff List'[Team]="Team1")))

I'm having a lot of difficulty trying to get the line value correct for the above graph. The value I am using now includes both teams, while I only want Team1 to be included. I suspect I'm missing something obvious and easy here for how to filter what I already have to only include 'team1'? Would there be an easy way to make this dynamic for the days and not just an average for the month?

The other question I had is for the simplest way to count and tabulate the number of days staff submitted a worklog, bearing in mind they will have submitted multiple worklogs each day. For some context the sum/frequency formula I would use for this in excel was:

=SUM(--(FREQUENCY(IF(F1:F100=A1,MATCH(T1:T100,T1:T100,0)),ROW(T1:T100)-ROW(T1)+1)>0))

I understand this is easily achieved with visuals and slicers/filters etc but I need this in a data/table format so that it can be used for further calculations.

Thank you in advance for any help/advice you can offer, sorry for the long post and potentially countless confusing errors included above!