You've never done a collaboration: where to start
Start by knowing what you want to show
Before you look for anyone, spend five minutes on a simple question: what part of your business would you like someone who doesn't know you yet to see? It could be one specific product, a service people tend to misunderstand, the window you just changed, or simply the fact that you exist on that street.
You don't need a strategy. You need one sentence you can say out loud without hesitating. That sentence is what you'll share with whoever collaborates with you. If it isn't clear in your own head, the other person won't guess it, and you'll end up with nice-looking content that says nothing about you.
One small goal you can actually check
The first time is not the moment to ask a collaboration to fix your quarter. Pick something small: that people know you've opened, that a new product gets seen, that someone finally understands a service that reads badly in writing.
A small goal has a practical advantage: it lets you know whether it went well. If you aim at three things at once, afterwards you won't be able to say which one worked.
Look before you write
Once you know what you want to show, find someone who posts about your area and spend a while looking at what they do. Don't just look at the photo: notice how they write, whether they reply to comments, whether the people answering them could walk through your door.
That bit of homework saves you most of the trouble later. If their tone doesn't fit yours, it won't fit when they talk about your business either, however well they do it.
The first message: short and specific
A good first message fits in five lines. Who you are, where you are, what you liked about their work and what you have in mind. No attachments, no full history of the business.
Specific means saying what you're proposing and what you're offering in return, even if it's modest. Leaving that part vague for "we'll sort it out later" drags the conversation out and makes experienced people lose interest.
Prepare the little there is to prepare
Before the agreed day, sort out the basics: which product or service is going to be shown, whether it's worth setting aside a quiet slot, and who on your team knows about it. If you work alone, look at the calendar and pick a moment when you won't be run off your feet.
And prepare one more thing: what you want people to understand. A fact, a difference, something customers always ask about. One single idea. Two already blur it.
Afterwards, talk to the person
When it's over, message them. Not to ask for a report, but to hear how it went for them: what was awkward, what surprised them, what they'd do differently. You usually get very useful information about how your business looks from the outside, which is exactly what you can't see yourself.
And write down what you learned somewhere. Even three lines in a note on your phone: what you asked for, what came out of it, what you'd change. The second time you'll move much faster.
The one thing to take away
A first collaboration isn't a launch. It's a test to learn how this works for you, for your business and for the people in your area. Treat it that way: small, with one clear idea, with someone whose work you've already looked at properly, and with a conversation at the end. Done like that, even the worst possible outcome leaves you something you can use next time.