I'd recommend finding a commander / general you like and building from there. EDHrec is a good site viewing cards that are commonly paired with different commanders. I liked Nekusar the mindrazor so much when I saw him come out that I built my commander deck around him. Sadly to say, commander is a format with many 3+ color decks. If you intend to do that, you are going to need a big investment in quality land or you'll get into bad spots.