School is very important.
I will have 2-5 universities eventually, with the odd college and a school house out on the frontier.
Early on put a farmer/fisher in a school house and put an indentured servant/free colonist/criminal on any square, where ever you need him. After several turns the teacher has taught the student his craft. Thus the Colonist turns into a farmer etc...
The criminal must become an indentured servant before he can then become a colonist then a farmer, thus it is best/quickest to educate free colonists.
The real special jobs like statesman/preacher can only be taught in university(3 at a time). All the skilled labor jobs can be taught in college(2 at a time). Universities can teach everything, but your teacher must be a specialist of some kind. You can also put three different specialists in university as teachers, for example farmer, blacksmith, statesman.
Many times I will have my major ports simply be university centers to educate new immigrants, grow lots of food, and generate mega liberty bells.
I try and get a college built in my tobacco town asap too because it seems tobacco planters are hard to come by.
Any way, pay for ore miners.$600 a pop., clear them in the new world and educate them how you choose.
Dont get me wrong either, I will buy specialists in the old world too, but not the quantity I need for statesmen.
Also, the higher your liberty bells/sons of liberty, the faster the education.