My name's Mike, and i'm just about to start a new aquarium, having never kept fish before

. I've done a bit of research, and have just bought a second hand tank L30 x H18 x W12, which i think comes to roughly 105 Litres, and which i'm hopefully going to go and pick up this weekend.
I've tried to do a bit of research, and read a lot of great posts and helpful advice on this site, so i've decided to start with a freshwater tank as I think it'd be best to start at the easier end of the scale!
Having had a look around one of my local
LFS with my girlfriend, she's pretty much decided that we're going to have a couple of red orandas lol.
I think this should be okay with the size of the tank, but i was wondering whether anybody could give me any advice on what, if any, other types of fish would be okay to put in with them? I quite like the idea of a shoal of Tetras or something similar, but know these would probably be too aggresive to put in with the Orandas. Any advice would be greatly appreciated.
Thanks!