After securing yourself a place in the Mages Guild, you may want to find what else Daggerfall has to offer. A letter from Lady Brisienna will likely arrive soon. It isn't a requirement to complete the main quest, but it provides a background for the game's situation, and prevents a heavy faction loss with Brisienna (though that impacts little).
You may want to find a [[Daggerfall:Fighters Guild|Fighters Guild]], a [[Daggerfall:Knightly_Orders|Knightly Order]], or a [[Daggerfall:Temples|Temple]] you consider worth joining. The stats provided in this tutorial will allow you to join the Fighters Guild, and you also qualify for a Knightly Order if you chose Long Blade and Archery as your weapon skills. You may also work for an invitation to the [[Daggerfall:Thieves_Guild|Thieves Guild]] or the [[Daggerfall:Dark_Brotherhood|Dark Brotherhood]]. For more variety, talk to any peasant within a city and ask for work using the buttons in the top left corner. You can use this to learn of merchants and innkeepers who have some urgent need at hand, usually for a monetary reward. You could also search out [[Daggerfall:Quests#Nobles|noble quests]], although these are harder to find. There are other sources of quests available in the world, but I won't detail them here.
As you gain levels, you'll receive unsolicited letters from people in far-off regions who will help you start the main quest. You can accept these quests or delay them indefinitely. When speaking to any NPC in the main quest, always accept the quest they offer, or you will never be given a second chance to do it; this will effectively break the main quest for that character forever.