Need custom field formula assistance

I am trying to create two separate custom fields based on a formulas and can't seem to make it work. 1st formula - Want to create a graphical indicator flag based on a task being more then 3 days late from current [Finish] date. So if Finish date is set at 2/1/16 and today's date is 2/5/16, a red flag would be placed in the custom field because it passed the criteria of more then 3 days late. I was thinking I could do an If statement using this thought process (Iif( [Finish] > [current date] + 3, then Red, else Green) but it certainly isn't working. Any help on this is appreciated. 2nd formula I don't even know how to construct but what I am trying to do is determine movement on a new milestone field that I created. So, if Deployment Milestone (setup with lookup table with defined values), is anything other then N/A (which is default value) and the finish date changed, then flag the task. The ultimate goal is to see impacts on overall program if a deployment is missed. I am assuming I would need to use baseline finish to compare against finish date. Again, thoughts on how to accomplish? Thank you and let me know if more information is needed.
I should also mention this is for MS Project 2010 Professional