The game will offer notably more encounters after your Cysealean business. But even during the murder quest you can go outside (or under ground) to fight enemies; I would recommend a mixture if you get bored of 'too much' dialog, which is a bit sad; the design of the characters (Esmeralda and Septimus, the Cheese Vendor, Aureus, just to name a few) is really fabulous and therefore, from a roleplay standpoint, there could be even more dialog. Questing, talking, trading, crafting, exploring, fighting, skilling - there are many activities you can choose; you don't have to separate these tasks.
After playing the game a while and exploring you will see that there is no strict order to play that game, and enough alternation.
