As for getting back to her place:
http://www.youtube.com/watch?v=2mZxFujEdQ0
If you only want the ONS, then why care about making it awkward bringing her back to yours, since you probably don't want to see her again?
As a side note, I live with my parents, although I have the upper floor to myself and enough doors to maintain privacy, in the morning one of my parents will often come up and meet a girl I've brought back over breakfast. My parents are very cool people and don't judge or say anything (except maybe to me later on "oh that was a nice one you should see her again"), but seeing the girl's reaction is often amusing. If they can handle that and are not freaked out about it, then they're definitely one to keep seeing if you like them. If they don't want to see you again because of that, then they're probably not worth hanging out with. As a general rule, most girls like me enough to keep seeing me anyway, and we often joke about how nervous they felt when my dad came upstairs to say hi the first time, if they ever even mention it again. As a general rule, if you act comfortable with something, then she's more likely to be comfortable with it too. This applies to everything from turning a conversation sexual to introducing a threesome to a MLTR, etc.
Back to your main question, the basic strategy for ONS/SNLs is as follows:
1. Turn the conversation sexual early on
2. Your screening / qualification questions should be about topics like spontaneity, outgoing, crazyness/wildness, not conforming to society's rules, doing what you feel, etc. (A qualification question like "can you cook?" is totally fine, but the underlying subext is "I'm looking for relationship material," which is not what you're going for.)
3. Sort out logistics and figure out how to deal with cockblocks, transport, bounce locations, etc. so that everything can be smoothly handled.
The k-close issue is an interesting one. I'm not sure if there's a definitive answer. I think in general just don't assume that because you k-closed, she definitely is DTF with you that night. It certainly means you have a certain amount of attraction and comfort going for you, but she may just like the attention or you may end up actually killing the sexual tension rather than building it.
If you do k-close, it's better to not do it too publicly, and make sure you're kino escalating using push pull. If you make sure to pull away first and leave her wanting more, and continue ramping up more sexual touching, then pulling away and making her chase you and want more, then it's more likely she's gonna get hot enough that the suggestion of going back to hers for another drink or to borrow the DVD or whatever will be more than enough for her to jump at the opportunity.
If for some reason logistics or something are in the way, don't get discouraged. Make sure to number close, and then continue having fun and meeting other girls.