Congrats on your new 'scope!!
Always the best advice here is to go to star parties n try before u buy, tho I didn't but did lots of research and especially members threads and recommendations.
Nearly a year ago I started with very similar gear n have been having lots a fun n learning heaps!
My next ep purchases were a tmb100deg fov 9mm and a tmb clone 6mm II planetary both second hand from iis classifieds. The 9 for the bigger views, not more mag. I haven't tried a top shelf barlow but found my Celestron narrowed the fov down too much to be enjoyable with the dob, tho I used it to test what mag I could use n then sought the eps.
I found the 6mm very good but the 100d 9mm spoilt me with the longer views between scope nudges. As you can see from my signature I recently upgraded to ES 82 deg. and I'm enjoying their views immensely. Tho the TMB 9 is is a real keeper!!
Be sure to see the adjoining thread here also, espec Alex's post re what will n won't work in ya newt
Enjoy, L