Re: Your first live match...
First match: The first year the Aus Open moved to its current location from Kooyong which was 1988. I don't remember who I saw, but I had a grounds pass and went about 3 days. We'd also played tennis there in the months prior (first time playing on rebound ace and I remember thinking I liked en tout cas better!).
Seat preference: Corner, but slightly around to the side rather than the end. As close to the front as possible, and also the side facing the cameras and umpire (who have been on the same side at the matches I've been to). If you're the side behind the ump and cameras they can restrict your view. But I too prefer early days and quallies. For me, walking around and seeing a load of different matches (plus my faves practicing and the mundaneness of walking to and from the court) is better than an arena seat where I might not enjoy the match as much, but feel obliged to stick with as I've paid $$$$ for the seat.). It's also economics: I can go for about 4 days for the price of one finals ticket.
As for Wimbledon .... don't worry about getting tickets. Do the Queue. Tons of fun, and a much better experience (IMHO) than a court seat. And if you get inside and really have to be in a show court, you can join the queue for returned tickets. I've done the Queue at Wimbles on 3 different years and everytime it's been a fabulous day.