I would recommend doing it outside as it stinks and the rust from the steel wool will stain concrete so do it in a shop or over the road. DIY Vintage Wood Stain look. (How to age new wood). Good for all things wood!
Vinegar works as a wood stain when you add a metal object in the mix and let it sit in a glass container for a week. A handful of pennies will produce a beautiful pale Caribbean blue stain. A wad of steel wool will give you a rich reddish hue.
How To Stain Wood So It Doesn't Look Blotchy & Horrible - use Minwax Pre-Stain Wood Conditioner, assures even stain penetration and prepares the wood to avoid blotching and streaking. Apply stain within 2 hours of applying conditioner
Miss Mustard Seed Painting Class: How to Mix Milk Paint & Three Amazing Finishes
Use Baking Soda and Vinegar to "quick weather wood" to look much like driftwood! Remove finish on wood with ratio of baking soda and water. Spray with vinegar and let sit minutes. Then scrub it off with a brush, rinse, dry, and stain or paint it.