straight-forward NL questions

thinking of playing my first B&M no-limit cash game next weekend.. just have a few questions,

i understand you can't take $$$$$ off the table. but if the wait is fairly short, can you leave the table and get another one 15 minutes later (for example)??? obviously if you have to wait a few hours, it's a different story.

any reason to buy in for more than the minimum (say 5/5 100-400 min-max).

can i buyin for more chips at any time between hands????

if they charge a time fee, is that in additon to the rake??? anyone know about niagara falls???

this is a difficult question: but do bad players get you off you flush straight draws?? is it generally worthwhile to play suited connectors with position??? very table dependent but i'm asking niagara falls (xx) casinos.

how careful do you have to be about pair of ace with a good kicker??? or is that just so table/board/situation dependent??

thanks very very much in advance for any or all help!!