29 gl (nano?)

[addam4208283]

i have been tossing back and forth the idea of either working with a 65gl tank or something smaller like a 29 or so. i can't seem to make up my mind on what to start with. i should first say that i am newbie, and am afraid of getting way over my head hence the going back and forth. so my question for you guys/gals is if i decide to go with a smaller tank than the 65 i have would it be ok if i got equipment that has the ability to be used on the larger tank?(50-100gal)
if this is ok i figured when time comes to go to the larger tank i would just add what i need to what i already have ex. another/larger heater, jet, etc.
thanks
ADAM