If you choose to provide a plane ticket, be sure to buy one that can be refunded (just in case). As VO's know you can refund plane tickets, I have always wondered if providing evidence of one in an application carries any weight. I would suggest you look at previous refusals on the forum so you can avoid any of those mistakes. You have to ensure your TIES TO HOME are strong. Ongoing good job to prove you are employable, solid bank balance, property ownership, family. These things are VERY important. Having an itinerary goes to proving "purpose of visit". Good Luck.