Definitely agree that O:I is a great place to start. It sounds like you are keen to get some demo games going and that is the most important thing really! I started on my own in the same way and now have 5-6 regular opponents, and a lot more who will play from time to time. I know there are other guys here that post on the board that are in the same situation.
Most
FLGS owners will be open to stocking a new line if they know it will sell. If you can get even a couple of guys even to try the game with a starter pack, playing in the store and then pulling in others that will sell more in turn and then things will roll along from there. Really, the cheap buy-in price, freely available rules and the gorgeous minis (not to mention the rule mechanics) will sell the game for you, if you can get people to make that initial effort. Good luck in any case
For the second question as Noir says it's possible to play most factions with that style. You could try something like Japanese sectorial for Yu Jing; some fast moving infantry that are effective at close range, a range of bikers etc. But, I had a force of Aleph move across the board and hit me in turn 1 with drop troops and Ajax just yesterday (look that guy up!) so it's possible with most factions.