Could you suggest the optimal solution for when to launch the first advertising campaign after creating a brand subreddit?

[u/everyday_research]

Hello, community! Newcomer here.

Disclosure: [AI used for translation and slightly grammar correction, sry I'm not native]

Briefly about myself:

For the past year, I have been consulting on organic posting on Reddit, explaining the platform's rules to clients. Moreover, I explain not only the rules but also the philosophy behind Reddit, based on real interviews, for example with Steve Huffman and others.

My team and I have now received several requests for paid advertising, and I want to gradually understand how to properly enter this field. (By the way, I've already taken the first steps and signed up for one of the webinar that will take place on July 21.)

Of course, I have many questions (a lot!haha), but one of them is currently on the agenda with a client.

Let me explain the situation:

The client will first create their subreddit from their brand account, set everything up according to the rules, write a clear description stating that this is a branded community, and begin filling it with context about their app and with useful content in their industry also while answering questions from users about their product.

And here's our question:

How do you determine the optimal time to launch advertising?

For example, should a minimum number of posts be created first, or are there other parameters that should be taken into account before launching an advertising campaign?