Help with some problems

So starting a project and have a couple of problems i cant figure out and cant find any tutorials on and have tryd so many different options just getting exhausted with it. the list is as of now i need to send a sms after a timer goes down and comes down after certain intervals, need to create a first time boot screen, and a database to auto load the phone number to the text message and i think thats where im at for now
thanks a lot if anyone's got some advice for where i can find some tutorials or some help