Hi...I am an Indian too and living in Ghana for last 6 months. Few things your friend needs to consider before he moves here. The company should take care of accommodation (otherwise it is a strict no no). Most of the houses here looks for 12 months advance. Be careful on that front. Taxis are very expensive, till the time I got my car, I used to spend almost $20 per day to and fro, just to go to office.
There are few Indian restaurants, and a normal meal will cost almost $15 -$20 (Say a biriyani and chicken dish). Panner Butter Masala would be GHS 15 - GHS 30 depending the type of restaurant. Can you believe onions here are sold here as per piece basis, and cost of one onion is 0.5 Cedis ($1 = GHS 2.82).
A Rs. 10/- Maggi Masala in Indian store is GHS 2 (or say Rs. 42/-)
Please ensure that he brings all the Indian spices for his cooking. Otherwise it will create a big hole in his pocket if he has to buy them over here.
If you can tell me where is he getting his accommodation and location of his office, I can give an approximate estimate of the travel cost.
But the best part about Ghana is (apart from it is too expensive), its a very safe country, and people are very courteous and nice.
All the best to him, if you have any query, please mail me.