I work for a university in the housing office. I would advise you to contact the university/colleges in the area you're thinking of buying as there a local variations in what students expect, and landlords offer.
For example, where I'm based 12 month tenancies are the norm, and bills are generally not included. It may be more straightforward t include them though, as sorting out bills are not strong points of students ime.
Buy the best quality furniture you can afford. If you are kitting out a whole house it may be worth contacting a hotel supplier. The furniture we have used has been very good quality, and reasonably priced.
Students will start looking for accommodation after the christmas break, then there is usually a lull between Easter and the summer break when there will be a second wave.
Bear in mind if you are going to supply any electrical items you will have to maintain or replace them if they stop working. I would just provide white goods myself, and consider a service contract for all appliances. If there is room a tumble dryer will prevent them drying washing all over the house and causing condensation.
HMO regs vary according to local authority, so check with them but the minimum mandatory license is for 5+ bedrooms on 3 or more floors. You also be required to apply for planning permission for change of use if you are changing from a private dwelling into an HMO, again check with LA.
Some groups of students are really switched on and you'll barely hear from them, whereas others are quite needy. You'll need to be prepared for them to call you at 3am when they've lost their keys and their housemates are out.