So, here's how it works.
You control: Your character, what he does and says, but you do not control the world around you. That ability is given to the storytellers. When you want to know more about something, you would type "*so and so* looks harder at *something* to learn more about it" not verbatim, any phrase, or sentence that gives us an idea of what you want works.
And that works with everything really, want to explore a house? Go explore it. Want to look for a certain pokemon? Go do it.
What you don't control is the outcome. Storytellers get to decide what you find, and sometimes how you found it, you don't get to decide you encountered a pidgy. Storytellers do. What you may do, is start the attempt to look for the pidgey.
When you catch a pokemon, you have a choice. You may control it's actions, as well as your own. Or, you may allow a storyteller to roleplay it. Either is fine, so long as you let a storyteller know. Once you make your choice, it's made for good. This is simply for the people who want to be surprised by their pokemon's actions, and have them act like real pets (That is, you never quite know what to expect). Other people don't really want that, and would rather dictate when their pokemon is being cuddly, or mean, or what have you. A storyteller for game purposes may roleplay any pokemon for a scene, however.
Your pokemon have stats, you don't. That's what pokemon is about, the pokemon, mostly. Remember, here, people would rather duke it out with pokemon than throw a few punches. That's how it works. It's pokemon after all.
You can collect items, vehicles, things, money... keep track of them in your profile. Even a tree branch is useful in the right situation.