I'm going to take it that you are talking about an EK civic? I have a EK1 (pre-facelift - CXi) in the Green, I love the colour now, am getting the whole car resprayed with a fresh coat of the same colour.

I am pretty new at modding too, as I am currently at uni and have NO money, lols. Just started work in the Army Reserves though, so money + mods are going to start increasing .

I can tell you a bit about I/H/E. Intake you have to be careful about, most intake mods aren't legal for p platers, though you can do some simple things. I have a cold air intake and will be getting a K&N panel filer, as long as its in the stock air box you are safe. As for swapping it, an upgraded panel filter in the stock box will fit both, but if you intend to go to something bigger like a Pod on a new intake arm, then your best off to wait till the swap. A D-series intake arm is different to a B-series (I think :P).

Headers won't be swappable. D series headers wont fit a B series engine, so if you are only going for mods you can re-use, headers are out.

Exhaust is one of the easiest parts to use for both engines. You can invest in a good exhaust system now, and when you can swap and turbo (if you lean that way) you wont have to touch the exhaust. You might get some strange looks if you get a full on big exhaust, ready for a b18 turbo build, and then drive around with it hooked up to a D16 :P, but don't let that phase you if you are set on your engine swap... only having to buy one exhaust is the easiest and cheapest plan, and you get the benefit from it all the way through

Also, all suspension, handling, lowering mods will all be fine before and after. The advice I got was get coilovers, sway bars, struts, camber kit etc, and do as much to the ride and handling as I could before the swap, as these all are not effected by the swap.

This is all advice I got given when I posted my own "I'm new to modding, tell me what's what" topic.

Hope it helped.