Hey, good job on deciding to grow some MJ! Marijuana growing is really addicting! Once you start, you can't stop! They tend to be like your own little babies once you start taking care of them.
Outdoor growing is great. How's the sunlight situation look like? Your plant would like at least 4 or 5 hours of direct sunlight each day (unless of cource it is cloudy, then what can ya do?)
Hopefully they are girls! I'm sure the genetics will be alright, good potent bud I'm sure!
Try not to feed any fertalizer if you have added your own potting soil with nutrients already in there. After about a month or so, you can add fert with no problems (unless you add too much!).
The watering schedule should be based upon your soil and it's moisture capacity. You could make a habit to check out when it's raining and when it won't, this will give you a general idea on the water status. Sunny days dry soils out more than any other days. If it's sunny for a whole week, you should probably go and check on it during the middle of the week or so. You don't want your babies without any available water. I've come back to a few plants severely wiliting and dying of thirst before. Growth slows when this happens. Always better to prevent a problem than to fix one.
Well, I just thought I'd post a few things on my mind. If anybody wants to correct anything I may have said, feel free.
Happy growing Herbologist!