Just a thought, but you should only be climbing on ropes and gear rated at 5,000 lbs or greater. If you fall, it won't be because your rope won't hold your big azz, but because you cut the rope, tied your hitch improperly, etc.
Start on a double rope, with a Blakes hitch on a tied tail. This is a setup which is easy for beginners to learn fairly quickly.
SRT is a more complicated system, and more expensive because of the additional equipment needed. Definitely not for beginners.
I usually use SRT for ascent, then tie in my double system. The main advantage of SRT is that it is much less exhausting to ascend. However, the DdRT is a great way to move around in the tree.