I'd start by choosing one clear outcome and one channel. Not "grow my brand", but something you can count, like "20 email sign-ups a month" or "10 quote requests a month" from Instagram or LinkedIn. If you're vague here, you'll chase views instead of results.
Then I'd pick the platform based on where buyers already are, not where you feel most comfy. If you sell to other businesses, that's often LinkedIn. If you sell to locals, it's usually Facebook or Instagram. Learn how people behave on that one platform before you add anything else.
Next, I'd map 3-4 content themes based on real questions and worries buyers have. For a local tradie, that could be: price and quotes, how long jobs take, before-and-afters, and common mistakes to avoid. For a small SaaS tool, it might be: the problem it fixes, short how-tos, customer stories, and reasons people hesitate to buy. This stops you from posting random stuff that doesn't move people closer to contacting you.
In the first few months, I'd treat social like a networking event, not a billboard. Reply to every comment, start DMs with people who engage, and join relevant conversations on other accounts. The early wins usually come from 1:1 chats, not viral posts.
For metrics, I'd ignore vanity numbers like total followers and focus on: profile visits, link clicks, replies/DMs, and how many posts lead to actual enquiries or sign-ups. If those are going up, your social media marketing is working, even if your follower count grows slowly.