I'm new!

I was reading through the "low growing flowers to sew in lawn" thread but figured I'd start a new one since people probably wouldn't check that one anymore.

I've just received a truckload of top soil - and was going to sew it as lawn, but have half a mind of having a meadow/prairie type area. It's only a small area (4mx5m?), and I was going to put a fire pit there too, so the area would be used to put a chair on, walk through. Just some questions about it though...

What do I need to fertilize it with (or do I?)?

Should I throw grass seed down with wildflowers?

Is there any particular wildflower mix I should get (native is probably best eh?)?

Any other things I should know or ask?

I'm new at this.

-penny