Ok i need some help guys, obviously i don't know *** about cars so I wan to know if i can swap my 98 honda civic single cam v-tech engine with a twin cam v-tech? any help is appreciated    

first and foremost it is vtec not vtech.  VTEC is a psuedo-acronym for variable Valve Timing and Electronic lift Control.  So basically you want to thow out your motor and get somthing more powerful then your d16y8.  First you need to locate a suitable engine.  There are lots to chose from so here i compiled a pretty good list.

B16A originally found in the civic si and other various dohc vtec models.
B17A1-integra gsr motor 2nd generation
B18C5-Integra Type R motor
B18C1-Integra GS-R motor
B20B/Z block mated with a B16A head

H series and F series
Basically any prelude motor is popular
H22A1/4 and the non vtec version the H23A1
The F22 and F23 series were less popular due to a SOHC configuration, we all like our motors with more cams and more flow. And these engines were found in various models of the accord and acura 2.2 models. These are not to be confused with the F20C and the F22C, those last two are the beasts of NA 4 cylinder motors, Good luck stuffing a Honda S2000 motor in you car.

Then of course there is the most expensive but best option, find a k series

K20A2- RSX type S motor, probably the best motor except for the Z1, without paying a bunch for a type r motor, it will be pricey, but worth it if you have the money.
K20A3-RSX base and 02-05 civic si motor, without the "good vtec" No point to this engine, not worth it
K20Z1-RSX type s motor a little more power years 05+
K20Z3 the 06+ civic si motor, also very good

K23a1- RDX, turbocharged but good luck swapping that, very different mounts says SCC.

Then any K24 bottom end mated with a k20 vtec head.

I would say the best options considering money would be the B16A or a B18C1.  Both of these motors have plenty of parts and are a easy swap and can be found of moderate price.  If you very very low on cash i would say a B18B and then a gsr head, or any other viable vtec head.  The best option would be a k20z1 or a k24 bottem end with a rsx head would be better.  You'll need motor mounts and wiring harnesses which can be found at hasport.com    
Then you'll need someone to throw it in.  And hopefully you've checked with state laws on engine swapping and emissions.  

So the short version is any honda 4cylinder will fit in your civic.