LFQV is FR Only. In France, at unmanned airfields, an overhead joins is required, and you shall always join the circuit at the beginning of the downwind leg. The pattern starts 500' overhead to observe the windsock and signals prior to joining downwind at published altitude, generally 1000' AAL.
Some clarity: 'FR Only' does not require that you are able to converse in french, only that all standard calls should be made using french. The pass overhead should be made at 1000 ft above the circuit height to observe the ground signals and windsock, and certainly not a 500 ft agl. The overhead join starting at a minimum of 500 ft above the published circuit is OK and then letting down to join at the downwind point at circuit height. The pattern whether controlled or not is the ICAO standard. Of course all this may be changed to suit local conditions as FlygendeNormann correctly points out but this will also be published.
Sam Rutherford offers good advice. The FR Only is a typically ingenious french way of dealing with the ICAO rule that all radio calls should be made in English. No one really cares that much, although the occasional Napoleonic individual believes it to be absolute and will become over exited and demand that you cannot land - ignore them. Its unlikely that french pilots will not understand standard phraseology as Sam suggests.