Hi, these are vary light weight for their size so that would be no problem.
This is a Whitewood Board and is not treated for outdoor use. It can be used outdoors if you apply a good protective coating of paint.
This material can be used for baseboard trim, but keep in mind that it is a soft wood and subject to damage from impact.
No,extra work is necessary.
Those boards are not made for flooring they are common boards if you're looking for beauty you might go a different route these boards are rugged they may splinter they are not made for flooring
It can be ordered online and picked up at a local store.
The Home Depot on Hurstbourne Lane in Louisville made several cuts like this for me to make a printer table out of 1x10's and 1x4's. I cut the 2x3 legs at home..