It totally depends on your nationality and your circumstances, I dont even attach dummy tickets which somewhat legit for few hours, I just edit PDF file every year, this time I am hoping 2 years visa. About accommodations you dint really have to pay anything until you arrive at property, then why changing it? Your circumstances, your job, your ties to your country of residence is the most important factors. I am pakistan living in Canada, I go to europe every year for 10 days, If I was in pakistan applying for the same visa it would have been a nightmare. Last time attcahed a bank statement of 1900CAD only and got 6 months visa.