The beginning would probably be the best idea.
I have known about the game for a while, when I say "known about" what I mean is, I was aware that there was a game called Infinity. I have always been predominantly a 'one game' kind of guy, as in, I will play one game as my main game to the detriment of all others. I dabble with the odd casual game in and around my main game too. I started with 40k back in 1995! I played that until the end/half way through 6th edition when my interest in it was really waning, I then picked up Dropzone Commander and have played that pretty religiously from the end of 2012 until now(ish).
Alex (over at the Epitude Rusk blog) is a massive fan boy of Infinity. He has a butt-load of models and even more scenery. He