If you want to start competitive, grab 2 night scythes, 2 annihilation barges and a box of warriors.
Split the the warriors into 2 groups in the flyers 5 or 6 strong each, build both barges as the shooty barges and build the overlords on foot to ride in the flyers.
After upgrades, you'll easily be at 750 and have a very strong core that you can branch out of.
I use ghost arks for an all foot list which isn't nearly as strong as flyer spam, but is still pretty fun.The ghost ark kit is a

to paint (and put together to a degree) for a new player.