How did Franklin's association with the printing-house help him propagating his ideas?

Franklin's printing-house was used for a variety of causes, producing pamphlets and articles to educate the people of Philadelphia and create awareness.

Necessity for a military;

"To promote this, I first wrote and published a pamphlet, entitled PLAIN TRUTH, in which I stated our defenceless situation in strong lights, with the necessity of union and discipline for our defense, and promis’d to propose in a few days an association, to be generally signed for that purpose."

Reforms;

".....he published “The Pennsylvania Gazette,” to which he contributed many essays, and which he made a medium for agitating a variety of local reforms."

Wisdom;

"In 1732 he began to issue his famous “Poor Richard’s Almanac” for the enrichment of which he borrowed or composed those pithy utterances of worldly wisdom which are the basis of a large part of his popular reputation. In 1758,

the year in which he ceases writing for the Almanac, he printed in it “Father Abraham’s Sermon,” now regarded as the most famous piece of literature produced in Colonial America."

Promotion of technology;

"To promote that demand, I wrote and published a pamphlet, entitled “An Account of the new-invented Pennsylvania Fireplaces; wherein their Construction and Manner of Operation is particularly explained...."