I'd suggest joining the TFL yahoo group if you're not already a member. If you are checkout message 49020 as this gives a starter force using 10mm Pendraken so should translate into 6mm.
The suggestion was 3 BTNS imperial imfantry, 1 of Indians, 1 of Aussies, 1 of Senegalese Tirailleurs, 6 MG section, 3 signal, 3 artillery, a Rolls AC, a MK IV tank and a squadron of cavalry
The Turks havs 3 BTNs Turkish Infantry, 1 of Arab Legion, 1 of Kurdish tribesmen, 6 MG sections, 3 signal, 3 artillery and a squadron of cavalry.
I play it in 20mm and have 3 British Battalions, 1 Scottish Battalion, 3 Indian Battalions, 1 ANZAC Battalion, lots of MG teams, two artillery pieces and a squadron of British cavalry.
My Turks are 4 32 man Battalions, 1 Regular Sanussi Battalion, 2 coys Turkish Sailors, lots of HMG teams, 2 guns and a squadron of cavalry.
Arabs are about 90 infantry, 15 Camelry, 1 HMG team and 30 Cavalry.
I'd probably go for a strip representing 1 game figure making an imperial company 8 strips etc
I also do East, West and South-West Africa but that's another story.
I hope this helps.
Phil