All you need to do is leave the 3 prong psu power cable connected to the wall socket and power supply with the on/off switch set to off on the back of the psu.
This way the case is grounded by the 3rd prong through the psu being screwed into the case.
Touch the hand you are using to move/mess with components onto bare metal anywhere on the case to make sure you are discharged before handling the delicates.
I work on a wood desk standing on carpet all the time, never have any static issues because of the simple process of keeping your psu hooked up to the wall/case.
Wrist strap is a waste of money (does the same thing you do/minus having a cable strapped to your wrist at all times making it harder to work on the case/components imo)
You should have basic warranties for your components through the manufacturers which are most likely more than enough unless the warranty is only a year long.
Basically, do like I said above and keep your ESD shoes on just so you know you aren't picking any static up through your feet that way and don't wear any clothes that generate static easily and you won't have any problems what so ever
What system parts are you going to be using in your build?