New and wanting learn. Advice?

For started I have never fly fished nor been around anyone who has. I just think it would be a fun hobby for me.

I recently purchased this set up at bass pro. (I have a $400 yearly allowance from work to purchase something outdoors related which is why I bought a $300 set up as a first timer).

Everything in the picture is what came with it.

My question is what all do I need to buy to be able to go to our local city/park lake to start practicing? They stock the lake with small trout and other smaller fish so it’s not likely I catch anything over a pound or 2 if I catch anything at all. I’m really just looking to get set up and start trying to learn to cast.

I’ve watched videos before on what all I need but that was almost a year ago and forgot. I only remember names of stuff like tippet and liter and all that stuff. Now that I have a set up I just want some advice on what I need to buy just to be able to go to the lake today and start practicing.