hello i am a new GM to rogue trader in itself, but not to other roleplaying games, i was wonder what is the order of the campaign books that fantasy flight publish cause i want to follow right behind from the main rogue trader book right into the next campaign following the story. can anyone help me.

I'm assuming that you want the most probable chronological order of the campaigns, not alphabetical. (Someone will probably post an alphabetical order here as a joke)

After the initial adventure from the RT book? Probably Forsaken Bounty and Dark Frontier (free downloads from FFG). Then you could do the adventure from the RT GM screen. Then Lure of the Expanse and finally the Warpstorm trilogy part 1.

But why not create your own as well? Hopefully I have understood your question.

yes! thank you, that is exactly what i wanted to know. and i am still new with the RT so the rules and combat are completely new to me so that is why i have not made my own game yet.

Thats great, have fun with it! A piece of good advice is to get very familiar with the adventure before playing it. Depending on your players there is typically a 40-60% chance that the adventure does not work like it is intended because the players did something unexpected. All you have to do then is to improvise a bit, and try to make it work for the players. Try not to force the players to do things, they will get bored if they can't choose what they want to do.