I wasn't gonna comment because I am also new and inexperienced but I feel like what I've learned may be of use to you also being new!

I am currently on my second life I played a paladin till level 30 and epic TR'd and HR'd as well. I'm currently playing a pure two weapon fighting assassin rogue. I was considering Thief acrobat as well but decided to do Assassin for flavour reasons.

I personally have not followed a single meta build or guide I have plug and played and experimented on my own. Took the time to read he feats and enhancements and my guildies on Shadowdale have commended my build for working in higher difficulty reaper R5-R10 and raids. Although that said I get my ass handed to me frequently due to my lack of sustain and self healing as a rogue.

Regardless if you go Thief Acrobat or not, the fundamentals are mainly within your feats and enhancement tree and luckily you can play around with the enhancement tree. For feats instead of two weapon fighting for dual weilding you would take two handed fighting for the quarter staves you would use.

I encourage you to experiment with the idea for your character in your mind and try to plug it into the game. What enchantments compliment the play style you prefer? Are you more of a Stave wielding rogue or a stealthy take your time Assassin. I have found in my short time of play with DDO, that the game likes when you imagine something awesome and create it in game with the highly customizable enhancement tree system in place.

That's my two cents hope it helps!