First off, let me start by saying I am a noob when it comes to snakes, with that said, I would prefer to get advice before the flames. Anyhow, this tank setup would be for a baby ball python, who would be moved to another tank when larger (I allready read the sticky that max snake size in tank= length+width of tank, and plan to upgrade accordingly). This is what I have, so please work with me on it (some stuff I may not need, as some of it was given to me for free), and tell me what I also need.

10 gallon glass tank w/ screen top
w/ 10-20 gallon under tank heater by zoo-med allready on it (sits on grips which sits on a plastic holder off ground)
Reptibark- pure fir bar
Expandable substrate that you mix with the fir bark (cant remember type, coconut?) to help with humidity
nondigital humidity gauge mounted on right hand corner
sticky unopened thermometer
10 inch esskay dome adjustable up to 200 watts w/dimmer function
100 watt neodymium daylight bulb
4 inch 200? watt unadjustable (has same 250v 660 watt ceramic part) w/blacklight/bulb in it, I believe 60 watts, but bulb looks to be from a hardware store, will this still work?
plastic fork split branch
Water dish.
Fake log, although I am not sure what to do with this, as I read you need two identicle hides.

With all this said, what else do I need, and how best would you go about setting this up (to get the 82-84 degree cold and 92-94 warm spot). Also, any cost that can be successfully cutout (without sacrifficing the snakes health of course) would be appreciated.
Also, I understand pictures would help, but currently I do not have access to a camera, so please work with me on this.

Finally, and I thank you for sticking with me so far, would a 29 gallon tank work as an upgrade (I allready have it) or would I be better off purchasing a 20L so that I would not lose as much heat bc of the less height. Also, the 29 gallon bottom is somewhat cracked, if that helps decide, but I planned on putting another sheet of glass or board or some other material (suggestions welcome) ontop of the whole bottom, so that the cracked glass would never come in contact w/the snake, but don't understand how I then would be able to mount an undertank heater by doing so.

Thank you very much to all who read and reply,
Warm-blooded