Received most of these trees from a bonsai nursery as an early xmas pres. Loving it as a hobby so far - very relaxing

Since having started I've been told (correct me if I'm wrong) that to form a beast of a tree - most of the time repotting into a larger pot and growing it out is the way to go. The Trident maple is the latest buy which I'd like to see grow into a beast. Have read that repotting in August is the best here - so thats the plan for all the trees. Big pots all round next year.
Until August - I'm looking to get some questions answered on each of my trees if any experienced people have the time

Juniper - Came wired - but should I do any more wiring/shaping here? Also should I be trimming all leaves that aren't facing up?
Fig - I plan to defoliate this one in the next few weeks to reduce leaf size. Have read that leaving the stem when cutting is the way to go? Also - should I bother wiring and shaping this one at all before a repot?
Chinese Elm - More of a display piece at the moment. Advice - other than repotting down the track?
Trident Maple - Should I bother doing anything to this other than letting it grow?
Also - do you think the glass tables I have them on will be burning/affecting the leaves? Should I lay down some sort of rubber mat over the glass?
Thanks in advance!