I disagree. Everyone has gotta start somewhere. Make sure you know the basics of energy manipulation, visualization, and grounding and centering.
Honestly, if you really want one and have never cast one ever before, a protection spell, good luck spell, or even maybe a money spell should be ok. Best would be the first two. Anything really white magick is ok too. Just make sure you got the basics covered. This site has a bunch of spells you can look through, pick the one you like best.