You seem to be just starting off, so I'll give you a few hints:
A. Never run more than x - x of any Stage 1. So for instance, it would be pointless to run 2 eevees and only 1 umbreon. Either 2-2 or 1-1 maximizes your potential.
B. Look at other decks in the deck garage for guidance. For instance, Energy Searches are almost never run, as are potions, exchangers, pokedexes, energy switches, etc. Running a solid Trainers and Supporters set is key in a good strategy. Something like 4 Pokemon Communications, 2 Pokemon Collectors, and 2-4 Proffessor Oak's New Theory is advised.
C. Is your Steelix Prime? If it isn't I would recommend it to be.
D. There are many good Dark/Steel combinations. If you are just trying to make a deck with what you have, then you should state so and then say what you have. If you are trying to aim more competitively, you should be prepared to spend quite a bit of money (up to $50) to get the cards you need.
Please PM me for help. I like teaching new people how to play competitively and to enjoy Pokemon TCG!