2

"Hagrid," said Harry, panting a bit as he ran to keep up, "did you say there are dragons at Gringotts?"
"Well, so they say," said Hagrid. "Crikey, I'd like a dragon."
"You'd like one?"
"Wanted one ever since I was a kid –– here we go."
They had reached the station. There was a train to London in five minutes' time. Hagrid, who didn't understand "Muggle money," as he called it, gave the bills to Harry so he could buy their tickets. (Harry Potter and the Sorcerer's Stone)

Does the phrase mean ‘let’s go’ or ‘said when something bad starts happening again’? (I guess the latter is more likely that Hagrid seems to blame himself.)

2

If you give someone something you can say "Here you go" to the person you are giving it to.

If I was bringing someone to the train station for example, I might say "here you go" on arriving at the station. I have given them the train station.

If I was bringing someone to the train station and I was also going to be travelling with them on the train, I might then say "here we go" on arriving at the station. I have given us the train station. This is the meaning of the sentence you mention above.

I would say "Here we go again" if someone started doing something again and again and that something was annoying me.

3

The following sentence, They had reached the station reveals the meaning of here we go. Hagrid was drawing attention to the fact that they had arrived at the destination, being the station.

3

"Here we go" could have different meanings, depending on situation, or how you say it. If you start telling a story that we all heard a dozen time, I'd say "Here we go..." indicating by voice how boring it is. If I help an old lady who isn't very firm on her feet to walk to another place, I might say "here we go" as a friendly, slightly condescending form of "start walking". When the first rocket of a fireworks goes up in the air, "Here we go" means "now the action starts". If I know the right way and walk ahead of a group and enter the correct one of three possible paths, I say "here we go" as "follow me".

In this case, Baz's third paragraph is exactly right. But consider if the text had continued: "'Wanted one ever since I was a kid –– here we go'. They had reached the station, and five armed policemen appeared out of nowhere". Suddenly it's "said when something bad starts happening".

3

The Oxford Advanced Learner's dictionary has an entry for "here we go" that applies perfectly to the quoted text:

here we go (spoken) said when something is starting to happen: "Here we go," thought Fred, "she's sure to say something."

In the context of the quoted text, Hagrid says "here we go" because they are about to reach the station.

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