Limit to TP, sure, theoretically you could max out each of your skills to your current level by buying enough TP orbs, but then, when you level you would probably not have enough to bring them all up to that new level, so more TP orbs, ad infinitum. People don't normally do this, they just level up the skills they use.
You can set a new recall in any zone by talking to the snoop in that zone and choosing that option.
You could buy a decorative pet from the item shop, or, try to trap one. Since you are a human and you started out in Howling Mountains, in the main town there, Logar, there is an NPC called a pet hunter, go talk to him, he will teach you how to catch a pet.
When you reach level 10 on your current class you will get a message that you can now go to the class hall in Varanas to choose a second class. When you choose your second, it will only be at lvl 1. You can switch to that class right there in the class hall, or at any house maid. What happens is that you will now be a lvl 1 whatever, lets say rogue. You will see yourself as a lvl 1 rogue/level 1 scout. go out and quest inside Varanas and you will quickly level. you will now see yourself as a lvl 2 rogue/lvl 2 scout, lvl 3/3, lvl 4/4 and so on till you reach lvl 10 rogue/lvl 10 scout. Now if you continue as rogue you will advance your rogue levels, but not your scout, so, lvl 11R/10S....lvl 12R/10S...and so on. Or, you could switch back to scout and level to say, 11S/10R.....12S/10R...and so on. If you never switch classes, you would continue to level scout so that your progression would look like 11S/1R....12S/1R...and so on. Most people like to keep there two classes close to each other until about level 50. The other thing you will notice is that with the second class there are a whole new set skills and abilities. Some of these are called general skills and they are usable on either class. others are Class skills and they are only usable on the specific class you have as primary. Later there will be elite skills that are specific to the particular class combination. In this example either R/S or S/R.
I always tell new people that choosing your second class is probably the most important thing you will do in RoM. Do your research and pick somthing that you will enjoy or that fits your play style.