Welcome, Pete! There are a lot of great folks here who will give you plenty of advice.
I think the WAV is ideal for a beginner. There are dots on the fingerboard to assist you in finding certain positions. (However, you should try to stop using the dots as soon as you can.)
Amps come in just about every size, shape and price range you can imagine. However, don't try to go cheap on your amp.
If you want something portable, check out the GK MB 150S. A lot of pros carry this amp. It's small and not very heavy, but it has tremendous sound. I don't own one (yet!) but I've played through one and consider it the best amp I've ever used.
You may also want to look at the Phil Jones Briefcase amp. I tried one of these with a BG in a store. I was impressed but, IMO, the GK still wins out. You might feel differently. The Briefcase is very portable.
I don't think you need two amps. One should suffice.
The question of a pre-amp is somewhat dependent on your amp. I use a pre-amp. I think the signal coming out of the WAV needs that boost, and it provides more control over tone.
I haven't seen the new, revised stand that comes with the WAV. I had the old one. It did fine, but I was constantly having to tighten the screws on it. I wanted the endpin conversion, so I bit the bullet and bought the endpin and the higher grade stand with the conversion kit to hold it. Well worth it if you play out a lot!
Good luck!
Alan