Mmm - I'm not in agreement about PT in the early stages of the game. The things you need don't cost as much early on, and a PT can be a very effective (if not a bit slower) way to get the things you want without being raided by higher level players. I utilised them a lot when I was starting out, and they are a good method. I've got guys a lot higher up in our Alliance (Global Gods) that still prefer them for big saves. (like an age upgrade)
When I was starting out, that's ALL I ever spend my crowns on, and I don't regret that at all.
The other best advice is to regularly collect your food and gold. That just minimises your exposure to raiding. You'll still get raided a bunch by higher level players, but it helps no end.