- Write you army first, for 40k, I would write a 2000 point list and then write a few extras as options, for fantasy a 2500 list with a few extras for options.
- Don't go over the top with conversions, buy some green stuff and cut bits up as well as kitbash but don't go over the top like have your land raider with a bloodthirster ripping the top off (as cool as it would be).
- If you can find cheaper alternative then use it, like sticking armor plates and gubbins onto ork boyz to make flashgitz.
Jacob.