don't do the dwarf sag. it never makes a nice short carpet, they grow out of control and will make you hate your life. the problem i had when I had an anubias dominated tank is that the growth rate was so slow that they would get BBA on them. sucked.
Welcome. It can be overwhelming at first, but there are many helpful people here. My first suggestion for you is to get yourself some live rock for biological filtration for your tank.
There is a contest going on right now catered specifically to smaller tanks (pico-reefs), and there are some great entries. Check em out and welcome to the club and the city.
I'm looking to experiment recharging GFO and DI resin, so if you're at the end of life on either of these items, save them up and I'll come get them from you. Thanks!