Weights - cheap to buy, gets good results, more effective way of getting results than some of the methods that have been suggested. Some methods listed here on this whole forum are hopeless.
Do a 2 day split, biceps one day, triceps next day, shoulders the next, same for the next 3 days, then rest last day of the week.
Plenty of excersises you can do for each day. Build a routine. use some types like bicep curls on biceps day, military press and triceps curl and etc on tricep day, and etc. Just build your own routine, doing short reps at high weight. High intensity workout which will improve your strength.
