Walling strategies and methods that I need to learn as a beginner

I'm back again with another noob question. I think I'm getting okay at sending a few units out to raid in Feudal and early castle. But much of the time opponents seem to have made a decent starting blocking wall. So I'll get stuck at the enemy wall and then get counter rushed at my own base because I suck at walling.

These kind of situations are usually happening around sub twenty-25 minutes where the economy I'm running is still tight for me so not many villagers can be spared for walls and blocking. But also, quite a few times people have their towns blocked off by sub 12 minutes, where I expect economies to be even more tight. Many maps have too big of sections just to block off with buildings as well.

Advice?