I went to RG four times so far, but my dad went the last 20 years or so
, so we have quite some experience getting in
we always try to get tickets for the first Thursday or Friday, and always get what we want. ( we do try to order them the first day you can order tickets)
we buy Court 1 tickets, then you have access to all annexes (small courts) where there are always very nice matches (especially for the 1st round, they can't put everyone on the show courts), but with the Court 1 tickets you always are sure to have 1 fixed seat on a court, in case it gets busy
but like other say, at around 5pm, you can get on any court you want if you try long enough
it just depends on who you want to see... if you want to see the Williams', Sharapova, Federer, Nadal, Henin etc, get Chatrier or Lenglen tickets. If you just want to see good tennis for little money, Court 1 or annex tickets will do (our court 1 tickets for the first Friday last year cost 28 euros).
It's a grand slam, 64 first round matches for women, 64 for men, all played in 2 days, there is ALWAYS a good match going on somewhere
that's also what I like about going to a grand slam. The big stars you can see on tv anytime, but the really interesting matches are often going on on the smaller courts!
about the food, I never had any problem taking food inside, drinks are a lot harder, you should look for the rules for that somewhere on the RG site.
and about the electronic tickets someone talked about here, just one remark: we got e-tickets 2 years ago, but if you have them, you have to take the back entrance. and when we were there, the waiting line was huge, so last year we went for the 'normal' tickets again
if you have any questions, just pm me