Just a further note to the above .. another way to save money is basically DON'T SPEND IT UNLESS NEEDED, if you don't buy weapons & armour as u level (as they are bound to drop anyway as you go along) and start saving as much money as u can from the get go only outlaying for basics (i.e repairs, basic training etc) then you will rack up gold really quickly, and by doing a lot of bg's whenever possible you could probably purchase yur first epic set at 70 ....
Note that I say all this in hindsight having spent nearly no time in the BG's diring lower levels, and by "forgetting" to level profesions as I levelled and rather doing them in batches whenever I got the inspiration to do so.
IF you lvl your professions as u lvl up it will cost less and it will in turn make it easier for you to earn cash from them
So horde your money & honour marks and battleground marks, weapons & gear will drop and this way by 70 you should be able to just purchase gear outright from hall of legends and possibly even your epic flyer straight away :O