I like to make the priest/healer a woman, She's also eye-candy for the party.
Female clerics are a venerable D&D tradition:
Okay... I guess Gary was doing it wrong when he wrote that most adventurers should retire at 7th level and the players roll up new characters. The Holmes Basic Set only went to level 3. The supplement went to level 6. They kept adding to it to increase the level limit, but Gary always stopped his games at level 7. Your character was supposed to retire and building a building suitable to their profession like castles for fighters.
Gary Gygax wrote most of his AD&D adventure modules for characters with levels of approximately 8 to 12. This started with the trio of Giants modules (G1-G3), which were the very first modules published by TSR and had pre-generated characters ranging from levels 9 to 14(!), followed by the trio of Drow modules (D1-D3) that were intended to be pursued by the same party that had just completed the Giants modules. Similar level ranges were expected for S1 Tomb of Horrors (6 to 14), S3 Expedition to the Barrier Peaks (8 to 12), S4 The Lost Cavern of Tsojcanth (slightly lower at 6 to 10), WG4 The Forgotten Temple of Tharizdun (8 to 10), EX1 Dungeonland (9 to 12), EX2 The Land Beyond the Magic Mirror (9 to 12), and WG5 Mordenkainen's Fantastic Adventure (9 to 12). WG6 Isle of the Ape was substantially higher, with a level range of 14 to 19.
The two low-level exceptions written by Gygax were B2 The Keep on the Borderlands, written as an introductory adventure for non-advanced D&D, and T1-T4 The Temple of Elemental Evil, written as relatively fast way for a new party (not necessarily new players), to advance to at least 8th level, at which point they would be ready for the kind of adventures preferred by Gygax. Note that Gary did not prefer truly high-level adventures, with characters far in advance of name level; in his view a party with levels 10 to 14 was sufficient to defeat Lolth in her own plane (Q1 Queen of the Demonweb Pits, written by artist David C. Sutherland III as the conclusion to the G and D series). However, he certainly didn't prefer low-level adventures, either.