Yo i'm down for this, I am by no means an expert in Pokemon though I have a fair amount of knowledge by large amount of exposure to it from others. I kinda feel bad that I am signing up for almost every game you run but giving that I am the first person to say something I guess I can't feel too bad.
It's fine. I appreciate your enthusiasm.

Note I have never used this system and so I may be slow or ask many questions.
Not to worry, it'll be a learning experience for both of us.

Question what will we use to make character sheets?
I'll look for a way to whip up a set of suitable character sheets. Not sure if the ones listed on the site are form-fillable, though if they are, we'll use those.
Also is there a general age or theme our characters should be geared towards.
The region in question requires Trainers be a minimum of 14 years of age, though a person can become a "Junior Trainer" at the age of 12. Most people in the region typically become Trainers around the ages of 16-18, however, so party members should be at least 14 and no older than 21.
As for theme, the region is divided into four main sub-regions, each with four Gyms. New Trainers can form a team of up to four members, who each earn four Badges (one in each sub-region) in order to qualify for the region's Pokémon League. Each player will have their own personal rival as well, who will be created and played by me. These rivals may form a rival team, or compete with each player individually.