Since each skill and subskill costs 100 gold to learn, you will quickly pauper yourself if you learn skills you don't need. Speaking of paupers, many young nobles squander the inheritance they begin with and find themselves with more followers that they can afford to support. Don't let this happen to you. There are a variety of ways to turn a coin in Olympia. The most obvious money maker is building a castle.
Castles allow nobles to rule over land and collect taxes from the native population.
Now most of the good castle building sights are claimed. A few sights remain in either remote or stone poor locations. So if you want to build a castle, the minimum you will need is a ship to find an isolated area and about 1200 gold saved up to pay your maintenance bills while the construction is going on. But obvious is not necessarily best, my friend. In many way, Olympia is much better now than it was during that initial land rush.