Unfortunately, when they translated the book from Spanish, they didn't re-alphabetize or anything, which really irks me. Thus the things are a little odd. Now, for skills there are two things to remember. On Primary skills (Attack, Dodge, Block, Magic Projection) you have to buy a minimum modifier of +5 if you decide to put points into them. It's a minimum of +10 in Secondary abilities. Now, if you don't have any points in a Secondary ability, you take a -30 to the roll, on top of your modifiers. And to be quite honest, I just got my hardcopy of Anima about a week and a half ago, and the last time I went over Psionics in depth was about...3 months ago, so I can't really remember.
The thing to remember is that Ki, Magic, Summoning, and Psionics are each their own sub system, with their advantages and disadvantages. You're automatically proficient with 1 weapon to start, and have to use Combat Modules to buy more. Chloe is right on how the Mystical Combat Modules work as well.
Now, as for the summoning abilities...depending on what you summon, it may or may not be hostile. Or it just might be so stupid that it'll attack anything. This is what Control is used to bypass. Still dangerous, but Control lets you do just about anything to a Being Between Worlds. Which is what Chimera turns you into, I should warn. Once summoned, a creature stays until it is Banished. So if you want to get rid of the creature, since Control can eventually be broken, it's useful to take. (And which is why Paladins get Banish as a cheap skill.) Bind is used for two things. First, and most commonly, to stick a summoned creature into an object. They're in stasis while in the object, and even your Control ability doesn't expire. The problem is maintaining the binding. The other thing it is used for is Binding a familiar, which can be very nice. Sorry, I'm a little sick, so I may be a bit sporadic in posting.