Can anyone help me here?

well, basically, i bought an electric scooter years ago, and the steering system broke so its been sitting there for a while. mainly i use a bike with 3 gears in front and 7 in back. i took apart the scooter and safely obtained all of the electronics from inside. so i already have a speed control handlebar (not sure how to attach this) the controller, batteries, and the motor. (and some lights and stuff) all of this is in working order. i also took the chain that attached the motor to the scooter wheel and the back wheel itself. i could get the gear off the wheel, but not the freewheeling part. (its pretty much welded to the wheel or something, i still have it if anyone has ideas of how to remove it) it turns out the chain is weird (i don't know many bike terms yet XD), its teeth are closer together then a standard bike gear/chain.

so i am wondering whats the best way to go about attaching this to the wheel. from what i have seen online, the most common way is buying a "southpaw freewheel" to attach to the left side of the back axle. however im not sure if this would fix my bike or not, and i am on a tight budget so i do not want to waste money. how can you tell if it would fit? also, how can i buy a matching tooth size gear to put on the motor shaft? i found out this is the motor i have online: >had to remove link because of forum<

i tried to contact this company to find out if they have any optional parts to put on the motor axle, but they have not responded as of yet.

the batteries (theirs two) weigh about 17 pounds, and i have found a read rack online that can take about 25 pounds, so i figured i could just use a few hose clamps to keep them in place after i order it.

so basically i can either find a way to attach this gear to my bike, and keep the motor and its gear, or if the company responds or you guys know where i can get a replacement gear, i can attach a southpaw freewheel and run that to the motor. (preferred) how would i go about mounting this motor and/or gear? i do not own any welding equipment, but i do have a large amount of hardware at home (nuts, bolts, and plates of all sizes). is it possible to attach the motor securely enough with nuts and bolts to withstand the pressure of bumps in the road and the torque of the motor?

i hope i have explained everything clearly, and i can take pictures or measurements if needed, thanks alot in advance for reading and helping.

sona1111, check out the site called---endless sphere. They are a electric bike sight that Aussie Jester told me about and have been a great help to me.
If it can be done it seems these folks have done it or know some one who has and where to get the parts to do it.

Steve.