First time hosting cash game

[Dan87]

I'm posting this asking for advice as to whether the system I am planning to use is good, and how it can improve.

Until now I have only hosted tournament style poker, which has been pretty simple. I was thinking about trying a cash game soon to spice things up, plus since there are no eliminations people don't get bored because they can't get knocked out.

The tournaments I host are usually 10$ buy-in, sometimes up to 20$ depending on how many people come, but mostly it is for entertainment. I'm keeping in mind how much money we regularly play for when coming up with the cash game amounts.

So far this is what I have thought would work best:

Game: NL Hold'em
Blinds: 25cents/50cents
Antes: None
Minimum Buyin: $10
Maximum Buyin: $50
Chip Denominations: 25cents/$1/$5

I have a few questions:

1)Are the Chip Denominations good for this game, or should I add some like 50cents or $2?

2)Should I allow cash to be used on the table, or will it be pointless and just confuse things since the buy-in is so small. It would be kind of funny to see someone slap 2 fives together and throw them on the table like Negreanu does with 50k bricks.

3)Should I allow people to add money to their stack whenever they want, everyone can add at a designated time like once every hour, or only when they bust out? I'm new to hosting cash games so I'm not sure what the best rules on this are.

4)How should I handle the cashouts? Is it good to let people come and go whenever they want (most likely resulting in some people cashing out when they have made a huge profit), or set a time when we all stop playing?

Thanks in advance for any help.