First off, the pickup in your guitar is built into the bridge, where it senses the string vibration. It does not depend on magnetic interaction, so you don't have to get steel 'electric' strings.

You should get a good set of bronze-wound strings, light guage. For acoustic guitars, something with a high E string sized at .010" or .011" should do nicely.

I recommend buying some kind of tuner, so you can be sure the strings are set to the right pitch. Even one of those Pan-pipe types, with reeds, is enough to keep you fairly close to proper pitch. This is important, because unless you have 'perfect pitch' (the ability to accurately know what pitch a particular note should have), you will gradually tune the guitar further and further away from true pitch because you think it sounds wrong.

Ovation makes good guitars. If you just had to buy a guitar without trying it out, you made a pretty good choice. The plastic back makes some models sound a bit 'glassy' compared to some all-wood guitars. This is like comparing the sound of a Fender Stratocaster to a Gibson Les Paul. Neither one is 'right', they're just different.