Goonie mentioned above, and I think Gazza touched on it the other day but for the first run just work on enjoying yourself, staying away from outlandish techniques and getting to the finish. Don't worry too much about specific yields. Any home grown weed is a godsend at the end of the day and you don't want to set specific expectations to live up to and lose enthusiasm.
But if you do want to guestimate a given footprints yield, using the 30-40w/ft2 and 1-1.5g per watt will give you a ballpark estimate on whatever space you plan on filling whether it be a 3x3 or custom space once you get your bearings set.
Outside is a different ballgame. So many variables based on strain choice, day length at your location after the turn of the season, weather, soil/beds or pots and medium choice, IPM, accumulated DLI (sunlight over 24hrs) and what not. For example around SEQLD you'd be able to get aorund 7-9 weeks veg depending on strain before things move into flower based on day length, whereas up north the window is smaller. But even with that in mind I wouldn't be confident on putting a number on anything.