Ok I think I have sorted the game structure out. if these seems rubbish please tell me and offer more advice.
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I have been reading up on it and taken advice from you guys but I am still unsure what quantity of chips to give each player. I am looking for no more than 4 hours play as per Blinds Schedule above. If I dish out 1000 each player, to me it does not seem enough, it is my first time hosting a game by the way.

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Now regarding the chip value, do I keep these the same through all levels till the end or would you suggest to increase them, say, every 4th level. Eg:
L 1-3 White 25 Red 100 as per poster above
L 4-6 White 100 Red 500
L 7-9 White 300 Red ??? etc
So how many chips and what are they worth?
Do I increase the chip value as the blinds increase in a set amount of levels?
Over to you guys
I love playing poker and sometimes make home tournaments, 6-seats, no buy-in, just sports play (personal quirk of mine) tho.
Levels: I'd recommend adding one level of 800/1600, I really doubt you'll need 2k/4k level by that time. From level 5 you might want to add antes, 10% of BB (so for 300bb 25 ante, 600bb 50 ante and so on). When you're done with Level 8 just do a colour up 25 -> 100 and you're golden.
20k/person should be enough for one play, might last you whole 4 hours, depending how aggressive you guys are, Rotty's chip suggestion is the most widely used I believe.
Just in case:
ante - a small sum you pay into pot just by being at the table, means people are not waiting for blinds to bleed, but they're bleeding every hand they are still in the game.
colour up - changing smallest valued chips for next in value, 25 -> 100, 100 -> 500. 25->100 goes like this:
1. Change 25s for every person who has enough 25s for even hundreds, if someone has 9x 25, give him 2x 100 and leave him 1x 25.
2. Shuffle the deck. Put leftover 25s in front of players.
3. From top of the deck, deal open faced cards for players clockwise, starting from UTG (dealer gets dealt last).
4. Going by the values, change 25s for 100s. If values are same, Spades are the highest, then Hearts, Clubs and last are Diamonds.
5. (to make 4. clear: No1 has 1x 25 , No2 has 3x 25s, rest have none left. No1 gets dealt Ace, No2 gets dealt a 10 6 and King. No1 gets the 100 for his single 25 while No2 gets nothing and loses his 25s.)
Sounded difficult until I've seen it in person and tried it myself. Easy.
Since you're 6 players, you can split the prize 40/20 for 1st and 2nd places too.
Oh, and I suggest at least one break, around halfway through.