To answer a few questions I've seen:
1. Yes, all feats you have earned to this point remain with you for the duration of your character's sad, pathetic, cosmically doomed life. I'm kidding, of course, about the sad and pathetic. Cosmically doomed remains to be seen.
2. For a magus: the spells per day table indicates how many spells of each level you may memorize and cast in a day, modified by your intelligence modifier as shown on the table
Abilities and Spellcasters a little way down the linked page. At each new level, you can add two spells of any level you are able to cast (so right now, it would be 0 or 1st-level spells). You can choose from any you don't know that are found in the official sources for the game (Core Rulebook, Advanced Player's Guide, Ultimate Magic). See
this link to look at spells by rulebook source.
3. Ember, remember (hey, that rhymes) that your spells per day are also modified by your Charisma score in the same way that Elora's are modified by her Intelligence score (see table linked above). 4 1st level spells per day is the base.
4. Remember that when gaining a level in a class, your save modifiers and base attack bonus can often go up. See your class page on d20pfsrd.com for that.
5. All the "free feats" are permanent.
Don't forget that multiclassing is a possibility. Every new level, you can choose to take a level in any class you qualify for and gain its 1st level abilities. If you need assistance in figuring out how to do that, let me know.