I am working on my first train set.  I hope to have 6 wyes  in this layout. My control panel is going to be a slide out under the main table. The wire on the wye is too short  to go to the panel.   Is there a jumper I can get or do I need to butt splice them to put  the switchs on the panel?

Have Class J 484 Freight Locomotive.  Hoping to find out what degree turn radius I need

I'm new at train works and need help with a few initial things.  I'm going to mack a track layout on a 4x8 table.  I understand that I'll need more than a 1 amp transformer to feed all this track.  Questions:
Can I use a 3 amp battery charger as a transformer?
If not, how much track can I feed with a 1 amp transformer?
Can I feed a number of trains on one track?
Can I feed a number of tracks on the same table?
Please help me get started!