RE: Does size really matter?
My first plane was a parkzone stryker so yes the superstar will be fine, just make sure it's not too windy as smaller planes usually don't like too much wind and also you will have to keep it closer as a smaller plane get much smaller quicker as it flies away from you.
I started with electric, i still have some but i also love my glow engines, with my first glow engine i only had a chicken stick ( old broom handle ), a glow ignitor, and a manual fuel pump mounted on my 1 gallon jug as my field equipment that's it, the #1 thing i loved about glow was flying for 10-15 minutes at a time, my stock stryker would only get 5-6 minutes per charge and waiting 1 hr for the pack to recharge was just plain boring and it didn't matter how many packs i bought it just seemed like i spent more time waiting than flying. I love landing waiting 5 minutes, refuel and back up in the air.
I know glow fuel is an ongoing cost but i spent more money on extra packs for my stryker than my fuel costs for 2 years on my glow engines.
Good luck