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The "rear sprocket" would be a freewheel. They are not meant to be serviced, so a new freewheel would be the common solution. If you actually mean the rear hub ball bearings you need to follow proper repair procedures and will need specialized tools If you have a local bike co-op ("bike kitchen") they can provide both tools and assistance. Otherwise Google "overhaul rear hub".
Not enough info here. Is it the rim or the hub that is wobbly? If the rim is out of true (and not actually bent) the spokes can be tightened to bring it back into true. If the hub is loose then the bearings need to be adjusted. Either adjustment can be done by your local bike shop for $10-20. A broken spoke can also make the wheel go out of true, this will cost a little more to fix.
There are a number things that could cause your problem.
First place start is with the rim. Is the rim (wheel) true (straight), if it is bent it could have the tire or brake rubbing. If that is the problem you need to true or straighten or have the rim straightened.
2nd place to go is are the brakes too tight? If so adjust brakes.
3rd place to go could be a seriouse problem. Is the axle frozen. To test you will have to take the wheel off the bike. With the wheel loose from the bike see if the axle will turn if not try to loosen the bearing lock nut just a very little (like 1/8 of a turn) did it free up the axle or does the axle bind a little but still turn smoothly? If so Loosen the lock nut a little more. Just enough that the wheel will allow the axle to spin freely but not so loose as to allow the wheel to wobble sideways at all. If the axle turns and grinds and clunks your bearings likely need to be replaced and or greased. Do not just squirt oil into the bearings it is too light and will not last.
Is the axle loose in the frame (quick release improperly installed); the axle loose in the wheel (hub bearings shot); or the spokes all loose or the rim untrue?
We have limitations to diagose physical problems.
Web searches for any or all of those malfunctions will lead to answers. Bike Shops will find/fix the latter two for you.
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