>I will be installing a few more packages this spring - and I would like to experiment with one package by making it a TBH.
They are fun.
> Anyone out there have any tips for starting this hive, and how hard is to begin...
Same as any hive. It's hard to know where to put the queen cage so I just direct release her.
>and would it be beneficial for me to have two TBH instead of one?
That depends on the TBH. Most of mine are just my long medium depth hives with top bars instead of frames. So if I were to need a frame or brood or some stores or whatever, I could steal them from one of my other medium depth hives.
But if your's is not a standard size that would interchange with your frames, it would be helpful to have a spare hive. Another option, however, whould be to make a couple of "swarm catching frames" like Dee Lusby's on Beesource except to fit your top bar hive. That way if you and to you could cut some brood from a regular hive and put it in the frame and put it in your top bar.