それから(and then; after that) is a conjunction which is placed between two sentences. It is used at the beginning of a sentence to indicate that the action expressed in that sentence occurs after the action expressed in preceding sentence is completed.
おおさかまで ふねで いきます。それから、うちまで でんしゃで いきます。
I'm going to Osaka by ship. Then, I'm going home by train.