If I wanted to buy $1,400 of bitcoin every week, should I buy $200 a day or should I buy the $1,400 every week?
Any options will be greatly appreciated.
It's better to buy it weekly due to transaction fees.
But another factor that you should also look is the chart, buy when the chart having a correction. If you don't know it yet you will have a 10 minutes read on the internet about chart analysis to know when the chart is in correction state, it will save some worth of dollars for you and you already save for fees by doing it weekly.