According to the data provided by Jeff Sackmann, these are the Grand Slams with the most 5 setters since 1969:
1969 Wimbledon 34
1983 US Open 34
2004 US Open 34
1992 Roland Garros 33
1994 Wimbledon 33
2001 Roland Garros 33
2010 Wimbledon 33
2012 Wimbledon 32
1976 Roland Garros 31
According to tennisabstract data, Björn Borg holds the male record in winning 5 set matches in a row. He won 13 over the course of 1976 to 1980.
Patrick Rafter won 12 in a row between 1995 and 2000 if we ignore losses by RET. If we do not ignore these, he won 11 in a row.
Lleyton Hewitt won 10 in a row between 2003 and 2006.
The following players won 9 at ...
Yes, random allocation.
See the following section in the official ITF Grand Slam rulebook (note that Wild Cards may be seeded):
Z. ENTRY PROCEDURES / 2. Singles Main Draw / g. Method of Draw
g. Method of Draw
A draw sheet for 128 places will be used. The placement
of seeds as heretofore provided. The remaining players, including ...
For a brand new tennis player, it doesn't really matter too much. Since they're new to the sport, they haven't developed a playstyle yet, and so it's impossible to know their strengths and weaknesses, their likes and dislikes, all of which are vital information in choosing a racket.
That being said, we can make some generalizations. Newer players are ...