Easy to get on. There is a gr booklet available at the local TO, entitled 'Golf in East Lothian'. Muirfield is nearby, but you need intro. Gullane is okay most days except Sat. No.3 best for beginners.
Visitor centre acts as clubhouse for nonmembers on nos.
Nostalgia still appeals though. It dates to 1774, fifth-oldest in Scotland. Every hole has character. Buddon Links is cheaper and often quiet. Combination tickets available.