I was there in 2000 and queued the whole first week.
I think there are 2 queues, but I always joined the one at Southfields station, so I can only comment on that one.
At what time you should arrive there depends on which kind of ticket you want to get - for Centre Court, Court No.1, Court No.2 or Ground ticket.
For a Centre Court ticket you will probably have to queue overnight or arrive VERY early, like 4 AM.
For a Court No.1 ticket - I once arrived at around 6 AM and was among the last few who got one. To be safe you should probably arrive at 5 AM.
For Court No. 2 you have to be there at around 6-6.30 AM.
Of course these times also depend on which court Timmy is playing on that day.
And of course these tickets are also valid for all other courts.
With a Ground ticket, you have admission to courts 3-19 and to the standing area on Court No.2.
There is only a limited number of Ground tickets available, once they are sold out you can't get in anymore until the late afternoon.
On most days I arrived at about 7.30-8 AM, and you will definitely get into the grounds that way. The gates open at 10.30 AM. But you don't have to worry if you are still in the queue at that time, as matches only begin at 12 AM, and you will still get a seat on most courts.
Exception: For the most popular seats, the uppest row on Court 3 from where you can also watch Court 2, you have to be at the gates at 10.30 AM (= begin queueing early), and once they open you have to run.
Court 18 is often crowded early too.
Shooter: Qualies aren't played in Wimbledon, they take place in Roehampton. Admission is free as far as I know.