Having airguns for quite a few years, as many on this forum will have, what lessons have you learnt ?
Expensive guns often are the cream, does everything you want. But try to sell on for an acceptable price to you and you will find the exciting hobby of collecting ! (DVD's are a good example).
Quality always count.
Scopes come with a vast ray of gimmicks and accordingly, prices. The best scope is the one that you can see clearly through with the crosshairs or dot, on the target. Not the one where it zooms into so you could see two fly's on a cowpat three fields away. You'll probably keep a scope longer than the gun.
Pellets. Never presume that one make and variety will shoot the same in all guns. Unfortunately, you can easily become a collector of pellets as well ! Find the right pellet for the gun and then buy a few tins. Check for prices and buy because the price never goes down.
Storage is important. Not only consider security but the humidity.
There must be more lessons, what's yours ? ( and don't say mine's a pint, cheers )