In reply to Oogachooga:
Sorry, just re-reading your post. I didn't realise you only had a few slings. Scrub my advice above.
Your post is quite mixed-up, I thought you wanted to top-rope to practice placing gear. I now see your new to climbing outdoors and don't have much kit.
You'll need more, as suggested above, and importantly know how to use it. Building top-rope anchors has it's own considerations, especially if using pro to build them (rather than just popping a few slings around a few trees).
> I would be comfortable climbing up to 5c max.
How do you know that if you've not climbed outdoors before? Start low and see how you go. There are some great diffs and v diffs about, well worth doing rather than skipping over and working your way up isn't a bad thing...
I think you'd be better trying to find someone with a bit more kit and experience to head out with, see what you need and how to use it.