Yes, that is fine. A lot of people like to use a bigger needle to draw with so it goes quicker without having to apply as much back pressure on the plunger, but a 24g will work fine as long as you don't have some of the thicker oils.
Your better off going to tractor supply and buying a pack of 18's to draw with. It cost like less then $2 and saves you a headache. Use 25 to pin with.
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I agree with Joeblow..go to Tractor Supply and at least get 22g to draw with..They're cheap as shit.. I usually just draw and pin Test E with a 22g. But since you already have 24g just draw with 22 and pin w/ 24, it'll be smooth and painless