Am planning a DONE3 starting in Europe and have a few questions I hope you can help me with.

1) It appears that GIB is about $1000 cheaper than EU airports. Am I correct on this?

2) I know that I will need to buy my ticket in GIB. I am guessing that I send money to a GIB travel agency. Then do they send me my ticket? Or do I have to pick it up in GIB?

3) Does anyone know a reputable travel agency in GIB to recommend to me?

4) I want to explore southern Spain. Are there any difficulties in going in and out from Gibralter?

Thanks for your help.