Okay! So we're doing skills. This is actually the part where I normally lose a few players, as skill points are a different sort of system. From your chosen ability scores earlier, Mirella's 'modifiers' look like this:
Str: 7 | -2
Dex: 11 | +0
Con: 11 | +0
Int: 14 | +2
Wis: 14 | +2
Cha: 18 | +4
The 'modifier' is what you add to things linked to that ability score, like skills. Now, the Sorcerer class skills...
Appraise (Int): Determine the value of a common item. Can also be used to bargain with shopkeepers.
Bluff (Cha: Lying to others, sending false messages, speaking in code.
Craft (Int): Creating things. You'd have to put points in multiple craft skills, specifying a different craft each time (armorsmithing, woodworking, etc).
Fly (Dex): The ability to direct yourself while flying. You need the ability to fly, first.
Intimidate (Cha): Demoralizing opponents and getting what you want through threats.
Knowledge (arcana) (Int): This knowledge skill allows you to know about magical history and some creatures.
Profession (Wis): A skill for jobs - like craft, you have to specify.
Spellcraft (Int): The skill used to identify spells that are being cast, or knowing which magical effects are in play.
Use Magic Device (Cha): Using magical items outside what your class would normally use. In your case, you'd have to roll on it to successfully use a scroll to heal.
Now, we get to the real meat of it. Every level, you'll get points to put into your skills. A Sorcerer gets 2 + their Intelligence modifier in skill points. In Mirella's case, that's 4: she gets 2 right away, plus the 2 points from her high intelligence. LOW intelligence does, in fact, remove the amount of skill points you get per level, to a minimum of 1.
You would then use those points on your skills. Adding them to class skills gives you a +3 bonus to it. So if Mirella wanted to point a single point (the maximum at this level) in her Spellcraft, it would look like this:
Spellcraft (Int): +6 | 2 | 1 | 3
She would get 2 from her intelligence score, the point she placed into the skill, and an extra 3 because it's a class skill. The total is '6', which is what she's adding to her dice rolls for Spellcraft.
Hope this helps!