You'll have to see how long it takes you to get over the illness. You'll be better off going in undertrained than starting training before you're able to. Get rid of the infection and then look at the training. Good luck !
1. Depends but it looks pretty promising. Do you have a half marathon planned to estimate your race time?
2. You need to get up to 20ish miles. If you can get 5 or so of them in then you will be well prepared. Its important not to race these. See point 1.
3. you need to taper down for the last few weeks.
4. Have a look at the race information. Will you be staying local or travelling on the day?
If the latter then allow more time so you're not stressed before the race.
You're spending hours each week training. It'd not kill you to read up on what you are meant to train like. We've seen umpteen people sabotage their own races by training badly.