Take a look at how I did ours,(I am no expert...the results sound like what you want)
I have atleast 2 drills at al times
I will predrill wood oversize alittle for the screws used(so drill doesn't have to drill both)
And then I will sometimes predrill metal with say a cheap 1/8 drill bit,then follow with a #10 or #12 self tapper.
Make sure to set drill to "rachet" and not drill or you may strip out holes.
...oops gotta godinners ready
For your use it will take power,esp. For a lot of screws....one drill set for drilling and one for screwing will help tho