If you're building a solid foundation, I'd focus on quality over quantity. A handful of trusted profile and business directory links is usually more valuable than hundreds of low-quality submissions.
I'd recommend starting with business directories and social profiles first. They're easy to create and help establish a natural backlink profile before moving on to stronger links.
Have you considered niche-specific directories as well? They often provide better value than general directories and can be more relevant to your website.
For document sharing, make sure you're uploading useful content instead of just placing links. Those platforms tend to perform better when the content has real value.
I recently built a similar foundation for one of my websites using profiles, directories, and Web 2.0 properties. It helped create a much more natural-looking backlink profile.
Business directory links are still worth having, especially if they're legitimate and relevant to your niche. I'd avoid low-quality directory lists, though.
Profile links are a great starting point, especially on trusted websites. Just make sure you complete the profiles properly instead of leaving them empty.
I usually begin every new website with social profiles, business citations, and a few quality directories. It's a simple way to establish an online presence.
I've had good experiences using reputable profile sites and document-sharing platforms. They may not move rankings overnight, but they help create a natural foundation.