Can I use 1/4 inch copper tubing with a compression needle valve to run propane to a gas light? I am worried that gas would leak from the compression fitting
Sounds like you should hire a qualified gasfitter. A properly connected compression fitting will not leak, but there's no point in DIY-ing gas lines if you're not 100% sure of your ability to get a leak free connection. Your propane supplier will usually either have people on staff, or know who to recommend locally.