Well shamoo. The resin is normally hard, dusty when shaped or filed and can be absorbant, like sponge it soaks up liquid/water/paint etc. You can only use industrial strength glue's or CA/superglue. We have a tube glue that is used by DIY folks who work around the house called Bostick. It's smelly and stringy ( open the windows when using) and suggests that you put a coat on each surface, leave it for ten minutes and join the two parts, BUT it sticks like compact adhesive, in other words you have one chance only to stick the two parts together in the right place and it's imovable!
Resin casting is totally different to 'Moulding' plastic. Resin parts can be super thin/fine or thick and need a bit of filing down to get the right thickness and joint with another part. I started with 1/43 resin kits to get a feel of resin and it's capabilities, that was about 15 years ago. You can see from my picture above of the kit and you can see the wheel faces just out of the makers mould witha fine thin 'flash' that needs to be removed carefully so not to damage the parts, also with the wheels they have that 'flash' between the spokes, so taking a sharp scalpel/craft blake a long time to remove between the spokes, but time taken is very worth it!
Also having to make a chassis to work/fit with a resin bodyshell, is also another matter, plastic would be the obviuos but finding a glue to suit both, could be CA or a type of household glue that DIYers use. It's trial and error.
One area I would look at is YouTube and type in what you want to know/see on film, there are a lot of tips on there.