I bought my 1st Total War game, and of course it's Warhammer! There is a LOT of info to grasp here. It's like learning Civ with a full blown RTS element to it! How the hell have I not tried these games over the years is beyond me! These battles are fuckin nuts!
During the tutorial/campaign I was told to siege a town...Ok. I did. Does this take like several turns of me not doing anything other than looking at the other factions move around? I mean I'm doing micro management shit, Like combining troops, but that's all. Am I supposed to be in a battle looking at me lay siege?
Tips?
Like others said, you don't want to spend turns sieging a town, at least not during normal games. The PC factions get an unfair amount of income anyway, so you aren't really doing much while tying up one of your armies.
A beginning player should start with High elves / Tyrion. His leadership ability will make maintaining a 20 stack army of spearmen and archers dirt cheap. Getting a 20 stack army should always be your first priority. Archers and spearmen are basic units, but since high elf units are very strong across the board, a 20 stack army with those will let you wipe any army early in the game.
When you combine troops, you lose xp on the troops, so try to avoid that. When possible, it is better to have experienced troops replenished.
When playing on normal, you can use diplomacy in the first few turns to make trade agreements, which will boost your income quite a bit for zero investment. Just rank factions according to how much they like you, then go down the list asking for trade agreement.
Do not make agreements other then trade agreements. Non-agression pacts will make factions that dislike the one you have them with, like you less. Military pacts with PC players will get you into wars which you didn't pick, so you absolutely don't want those.
Look at your starter town, and see what towns you need to conquer to complete your province, this will allow you get a bonus, on normal get +population growth.
+pop growth should be a priority when playing at normal difficulty, evolve your towns so you have level 3 town centers along with level 2 walls, and they'll be able to fend off most attackers, so build the cheap growth buildings, you can always destroy them later
If you want to level Tyrion (you should), you can try finding a settlement of low value (not one you intend to build within 20 turns), and repeatedly attack & loot it. Similarly, attacking a weaker army and allowing it to flee, will yield a lot more xp then destroying it in a single battle.