If its electric then its probably something with the battery try charging it again if you haven't already. If it is a spring gun then take the mag out and dry fire once to see if it will fire at all.
yes
Yes
Yes you have to every time. It depends on the spring tension.
Yes, you will have to re-cock the spring every shot.
no spring guns have to be manualy cocked every time. Only electric or gas can shoot automatic.
A pump airsoft gun is a gun that has to be pumped every time before shooting. Ex. Airsoft shotgun
Yes, because you can get multiple shots off versus a spring-cocking action which you have to do everytime to get a shot off. Whatever you do, do buy a gas operated one. It's messy and you have to keep buying gas. If you want a repeating shot airsoft gun without the cost of gas, go with an electric gun. It save you money by not buying gas, and you still can fire multiple times without cocking every single time like a spring operated gun. Email me at vino12@aim.com if you have anymore questions about airsoft or real guns and their ammunitions.
No
almost every gun for airsoft uses a 6mm (milimeter) BB. try that.
pretty much alot of people worldwide own airsoft guns, think about it this way, 1 of of every 6 person in the united states owns an airsoft gun i don't know about Europe because i don't live there>
A person can buy airsoft rifles from an airsoft store, gun store, and a sport store. They are all reflective cheap in every store depending on the model you wish to buy.
They do not make 30 gram BB's. Although, the do make .3 gram BB's which is what I think you meant. Almost every online airsoft store sells them. I love Airsoft GI (Link below) because they have amazing customer service and quick order processing. I highly reccommend you buy from them.