I need help in fantasy football, drop travaris jackson and pick up who?

hey guys, first year doing fantasy football and i need a little advice, i have phillip rivers and carson palmer as my starting QB's in a twelve team league and by the way palmer has been playing i start rivers...so i WAS looking to get rid of palmer and have travaris jackson as my back up but since jackson isnt starter i need to drop him for someone else...who do you suggest?? keep in mind its a twelve person league and on my bench i have fred taylor-rb, owen daniels-te, antwann randle el-wr, carson palmer- qb, and travaris jackson-qb who im looking to drop, what position do u suggest i pick up and who do u think is available in a twelve person league that i should pick up. Thanks.