Your engine will idle with the throttle stick pulled back towards you, if the "trim tab" is pushed away from you. The trim tab is there to (1) provide a shutoff, when you want to stop the engine, and (2) provide idle speed, when you don't want the engine to die with the stick pulled back.

The engine will probably idle around 2000 RPM or so. That's more or less normal for our small engines. It might sound like it's screaming, but reliable idle under about 1600 RPM is rare.

You will be responsible for setting your throttle link up so that you can (1) kill the engine by pulling the stick and trim tab back, and (2) so that your engine will idle when the trim tab is pushed away from you, with the stick pulled back toward you.

These setup items are readily explained in person by an experienced flier. Not so easy in writing, on these forums. Everyone is recommending you find an experienced flier for that reason.

If you insist on doing it all yourself, please use your friend to restrain the plane when starting. And make sure no one is in the plane of the propeller arc - if something drops into the prop, it will be flung off in that plane, hitting whomever is in the path.

Good luck,
Dave Olson