I suggest run Dailies,it is the good way to make credits
Each day you can get,
40k from Black Hole
40k from CZ
60k from Ilum
60k from Oricon
70k from Section X
70k from Mekab
50k from Yavin 4
50k from Rishi
for 1 Charecter
is it enough ? for more info : http://dulfy.net/2014/08/11/swtor-daily-credits-guide/