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I bought a used bike that was set up with tubeless wheels, however both valves are shot what should I do? In general, is there more maintenance involved with the upkeep of tubeless wheels? Because I'm thinking of just throwing some tubes in there and call it good.

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    what do you mean by 'valves are shot'? any tubeless valve is going to have replaceable valve cores, so that is easy enough. If the valves themselves are stripped, it's still just removing the tire (as you would for a flat fix) and replacing the entire valve. This would require a compressor or something similar to reseat the tire most likely. – Paul Jan 4 '17 at 19:19
  • The one presta valve has the little stem thing missing and the other presta valve seems to leak air even when i have it screwed down tight and closed... i can still add air with it but it is also leaking the air right back. I do have a little compressor, but i probably need a presta chuck for my compressor to reseat it? – Eric Swiggum Jan 4 '17 at 19:48
  • Adding tubes should fix your problem, assuming the rims and tyres are tube-compatible and are not tubeless-only. – Criggie Jan 4 '17 at 20:14
  • @eric you would need a presta chuck or a presta adapter as seen here fcdn.mtbr.com/attachments/29er-components/… – Paul Jan 4 '17 at 20:53
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    Entire new tubeless valve stems aren't expensive, they're about the same price as a new tube. You can also DIY them from an old tube more or less for free. – Jamie A Jan 4 '17 at 22:03
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As long as the wrench flats on the valve core are still accessible, you should be able to replace just the valve core:

presta valve

from https://bicycles.stackexchange.com/a/36955/30982

presta valve in pieces

http://k0lee.com/2009/10/putting-tire-sealant-in-presta-valve-tubes/

If there is leaking, you could spray some soapy water around the valve to see where its leaking from. If its leaking between the valve and the rim, possibly the valve is not tight enough. To tighten: from inside the rim, push the valve 'outward' (towards hub) and tighten down lockring by hand. Never tighten with a wrench as you'll never be able to remove it on the trail! (I've learned the hard way).

As far as 'is tubeless worth it?' or 'is it more complicated?' that will be largely opinion based and an internet search will likely turn up countless discussion. A simple answer would be: do what lets you ride your dang bike. If you're familiar with tubes, throw some tubes in there and go shred. some winter if you're looking for a project, get a friend who is more familiar with it and give it a go.

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