Where is your area? For a start, you can get refurbished pumps along outer ring Rd near Umoja one. Or if you want new ones, visit P J Petroleum Equipment Ltd in industrial area on Dunga Road, Opposite Ministry of Public Works. Since you want to start small, go for kerosene. The pumps are normally electric so you will need electricity, though they have options for manual crank. The pumps were costing around 150K sometime last year, not sure how much they are now. Remember not to locate your pump near a residential area as it will not be licensed by the authorities. For your stocks of kerosene, just visit the nearest petrol station and ask them who supplies their stock. And remember, kerosene is usually used by the low income folks, so go slow on your margins. This group is very sensitive to price. Don't price yourself out of business.