This is my first post so please be gentle .

I have just purchased a frame for around town and just fun riding .
I will be running it single speed and need to get a Crankset and Bottom Bracket .
The BB is 68mm English and I would like an axle length of 110mm - 113mm to get good chain alignment .
I would really like to use BMX type cranks if possible ( 170mm cranks - 44 tooth sprocket ).
I'm new to all this and the more I try to research , the more confused I've become .
Could someone recommend me a BMX type Crankset - BB combination that will fit my 68mm English bottom bracket ?
I will be buying online and don't want to make a mistake and order something that doesn't fit .
Help

Ken