You should have the resources to build at least 1 knight,
queue a few vills, build a defensive TC near wood /gold (maybe both) and get
a forward TC where you can protect your forward vills and archers
until your knights can take over supported by the archers in case he builds
spears. A forward TC close to his main Gold Mine is really nice.
Attack his other resources with your army
(knights) and use your TC as a save haven.
Boom at your home base, you should build
new farms with the first vills produced in castle age since you are not very
high on food.
Don't forget to get a monastery, a blacksmith and a siege workshop.
Conclusion :
This strategy should lead to an economic advantage over your opponent. Further,
you can quickly cover resources all over the map while keeping him/her busy
defending. Don't make the mistake to go for the Imperial-boom, since a good
castle attack can do much more damage then a race to imperial (rams are great
to kill TCs, monks are great to defend them against knights, archers can kill
the pikes/infantry that attacks your rams).