So by saying that you're a Christian but you're open to many spiritual ideas you're really saying that you're open to being deceived.
There's no such thing as karma. There is God who rewards and punishes. Both in this age and the age to come.
(Jeremiah 17:10 NIV) "I the LORD search the heart and examine the mind, to reward a man according to his conduct, according to what his deeds deserve."
The Bible is clear that there's no such thing as reincarnation.
(Hebrews 9:27-28 NIV) Just as man is destined to die once, and after that to face judgment, {28} so Christ was sacrificed once to take away the sins of many people; and he will appear a second time, not to bear sin, but to bring salvation to those who are waiting for him.
RE: Does Christianity believe in Karma? - Karma from a Christian point of view