i did half my training as a breast feeding councillor and have a few tips .
make sure you are comfortable when starting to feed . if your not relaxed and comfortable then you wont get "let down" reflex .
try different positions as suggested that could make all the difference.
try not to worry just yet as your ds could just be tired from birth . my dd3 didnt really start feeding regulary til day 3 when my milk came in .
keep feeding if and when you can to stimulate your milk production , avoiding letting it dry up . the more you feed the more you produce
dont give bottles if possible as your baby may get "nipple confusion" and not know what is being put in his mouth . bottle feeding is easier for babies and you dont want him getting used to easy feeding if you are intending to breast feed.
make sure his bottom lip is sticking right out when latching him on to your nipple . if he isnt postioned correctly he wont get much milk and he and YOU will get frustrated .
relax relax relax - get a drink , light some candles have a bath and lay him /hold him next to your skin and have a cuddle for a minute or 2 to let him smell you first then gently latch him on .
HTH