Yes, they will advice you on what you can claim as expenses such as a percent of rent you pay, a % of utility bills even things such as toilet roll....
Yes I would do what meathead said. Also do you have any other part time job / other income as well as online? As this will be added to the 7k and may...
After the past update all blogs kept the PageRank just fine so this shouldn't be an issue unless you do something dodgy so Google penalize you. There...