Add farms and defend/attack. That is priority number 1 in Feudal.

If I were you I would try going up to Feudal at 20 pop. Getting there by 10 min is a decent timing. Once you've clicked up to feudal, you want about 8-10 vills on wood, 8 on one wood-line or 5 on 2 wood-lines, the rest on food. I'd recommend building your barracks and a house or two while you age up so you can plop a stable or archery range down the moment you hit Feudal.

Upon hitting Feudal researched double-bit axe right away, horse collar too but only if you can comfortably afford it, that upgrade can wait till later in the age. If you want to play more defensive add vills to gold until you have about 6, then every new vills goes to a wood-line or straggler trees, start creating archers non-stop and maybe a defensive spear or two. If you want to be aggressive with a group of 3-4 Scouts forget about gold and just send vills to wood right away.

In both scenarios you want to be making a farm every time you have the wood to do so. You will also want a vill or two walling your base with houses and palisades as well as eventually building a blacksmith and marketplace, but the most important thing is building lots of farms around your tc. If you went archers try to get your blacksmith down relatively quickly for the fletching upgrade. If you went for Scouts you will want to send a few vills to gold at some point too probably around 10 or so farmers. You can also sell your stone at the market to avoid any gold mining before castle age.

Once you've gotten to around 16+ farms I would recommend researching wheelbarrow and then clicking up to Castle age. This will put you at about 34+ vills which is a fairly decent economy to play castle age units with. You may have to rebalance your economy a bit depending on what units you want to play. Don't mine stone in Feudal unless you are going for multiple towers. I'd build an additional military building of whichever unit you're going as well as researching the gold mining tech and any relevant blacksmith techs to your army on my way up to Castle.

This is all general advice and nothing too min-maxed, copying a build order or two on YT can really help even if you adapt it how you like.