Just Connect 1kOhm resistor as it is easily available...less than 1kOhm resistors wont be easy to fine...and 1k resistors works perfectly fine with LEDs in series and connest LEDs +ve and -ve terminal correctly ...if connections are wrong they won't work but they won't get damage either,if resistor is connected correctly,,,it doesnt matter fron where you give it a connection....do as you feel easy and looks neat...