Unless you are really fat or really massive a 1" is the preffered length for the legs, shoulders biceps and calves I am not sure on as I have not pinned there yet. PS just because a needle is 1" does not mean you need to go in 1" I generally insert the needle about .8" on thigh shots, and insert the 1.5" needle about 1.25 on glutes.

As far as biceps and calves do you really plan to hit those right away? The biceps if you have any problem like soreness (or God forbid abcess) will really screw up your workout, and calves are painful as hell for most. Generally by rotating glutes and thighs and then shoulders if needed you have plenty of real estate unless you are pinning multiple short esters.