How Long a snowboard I need for my size, size?

I'll be snowboarding for the first time. I am 5'1, 170 lbs. I wear a size women's shoes 8.5-9. I know that boards are in cm. so I need to know what size board I should be sought. Thank you!

If you want to own a snowboard, I want you to buy a 149cm-151cm as a beginner. If you rent, they can you give a shorter board as a 145cm, which is good for the first two times. It is easier to learn on shorter boards. And the size width approximately 240mm, give or take ~ 3 mm.

NEW 2012 SYSTEM WISH 150 WOMENS SNOWBOARD+ROXY BLK BINDINGS+FLOW BOOTS FREE BAG $349.00 Time Remaining: 39m Buy It Now for only: $349.00

LTD Mist 154 Womens Snowboard + LTD LT250 Bindings $224.96 Time Remaining: 1h 4m Buy It Now for only: $249.95

Celsius Fenom O zone Womens Snowboard Boots $34.99 Time Remaining: 1h 9m Buy It Now for only: $34.99

NEW 2012 SYSTEM MAI TIE DYE 147 SNOWBOARD+BINDINGS+FLOW BOOTS PACKAGE RIDE ON $289.00 Time Remaining: 1h 10m Buy It Now for only: $289.00

Burton Womens Snowboard jacket size Medium $19.99 Time Remaining: 1h 18m Buy It Now for only: $99.99

NEW 2012 SYSTEM WISH 144 WOMENS SNOWBOARD+ROXY BLK BINDINGS+FLOW BOOTS FREE BAG $349.00 Time Remaining: 1h 20m Buy It Now for only: $349.00

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New Rossignol Temptation Snowboard 143cm $230.00 Time Remaining: 1h 34m Buy It Now for only: $230.00

5150 Amethyst 149 Womens Snowboard + Ride VXN Bindings + DC Boots $278.96 Time Remaining: 1h 35m Buy It Now for only: $309.95

Used Rossignol Black Gray Womens Snowboard Boot $29.99 Time Remaining: 2h 6m Buy It Now for only: $29.99

Morrow Dream 154 Womens Snowboard + Morrow Lotus Bindings $215.96 Time Remaining: 2h 32m Buy It Now for only: $239.95

DC Womens Snowboarding Boots Phase 2011 Size 6 302802 WI 2011 $70.00 Time Remaining: 2h 51m Buy It Now for only: $70.00

Burton Ruler Snowboard Boots Black Womens EUR 38 US Womens 7 $27.99 Time Remaining: 2h 52m Buy It Now for only: $27.99

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BURTON FEATHER WOMENS SNOWBOARD 2012 SIZE 156 NEW $212.99 Time Remaining: 4h 10m Buy It Now for only: $212.99

Salomon Kiana black Snowboard Boots 85 2012 $75.00 Time Remaining: 4h 11m Buy It Now for only: $95.00

Salomon the fatale Snowboard Boots 85 2012 $69.00 Time Remaining: 4h 16m Buy It Now for only: $89.00

Salomon Pearl Boa Snowboard Boots 85 2012 $69.00 Time Remaining: 4h 19m Buy It Now for only: $99.00

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Salomon linea Snowboard Boots 85 2012 $45.00 Time Remaining: 4h 38m Buy It Now for only: $69.00

5150 Prism Womens 153 Womens Snowboard + Rossignol Justice Bindings + DC Boots $359.96 Time Remaining: 4h 44m Buy It Now for only: $399.95

VANS New 2012 Aura Snowboarding Boots Ladies Size 7 $224.99 Time Remaining: 4h 47m Buy It Now for only: $224.99

NEW 2012 Roxy Silhouette 146 Snowboard Package+Roxy Rock It Dash Bindings Size M $499.00 Time Remaining: 4h 52m Buy It Now for only: $499.00

NEW WOMENS K2 FLING SNOWBOARD 0 149 $269.99 Time Remaining: 5h 1m Buy It Now for only: $269.99

NEW WOMENS K2 MOMENT SNOWBOARD 0 146 $199.99 Time Remaining: 5h 1m Buy It Now for only: $199.99

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Raiden Eris MD Womens 2011 Snowboard Bindings Small $119.99 Time Remaining: 5h 8m Buy It Now for only: $119.99

NEW MATRIX DREAM SNOWBOARD BINDINGS BOOTS 110cm 120cm $199.00 Time Remaining: 5h 8m Buy It Now for only: $199.00

Lamar Whisper 154 Womens Snowboard + Technine JV Toe Cap Bindings $179.96 Time Remaining: 5h 14m Buy It Now for only: $199.95

SANTA CRUZ LADIES Size 12 Snowboard Pant Ski Trousers Salopettes Womens Retro $158.03 Time Remaining: 5h 15m Buy It Now for only: $158.03

2012 Salomon Oh Yeah Womens Snowboard 147 cm Brand New $260.10 Time Remaining: 5h 16m Buy It Now for only: $260.10

NEW MATRIX PINK SNOWBOARD BINDINGS BOOTS 130cm 154cm $199.00 Time Remaining: 5h 27m Buy It Now for only: $199.00

Technine True Love 151 Womens Snowboard + Rossignol Circus Bindings $296.96 Time Remaining: 5h 44m Buy It Now for only: $329.95

Nitro 2009 Womens Barrage snowboard boots Sz60 New $99.00 Time Remaining: 5h 49m Buy It Now for only: $99.00

Used Salomon Siam Blue Yellow Snowboard Boots $39.99 Time Remaining: 6h 7m Buy It Now for only: $39.99

Charcoal Blue Burton Driver Sz 7 Womens Snowboard Boots $25.00 Time Remaining: 6h 8m

Thinsulate Heelside Snowboard Boots Snow Womens Size 6 37 $19.99 Time Remaining: 6h 14m Buy It Now for only: $19.99

New 2012 Flow Womens Lotus BOA Coiler Snowboard Boots Black Silver Size 10 $159.99 Time Remaining: 6h 15m Buy It Now for only: $159.99

Used Burton Foundation Blue Snowboard Boots Womens 6 $39.99 Time Remaining: 6h 21m Buy It Now for only: $39.99

BURTON MINT WOMENS BOOT SNOWBOARDING 2012 WHITE NEW $90.99 Time Remaining: 6h 25m Buy It Now for only: $90.99

Salomon 2007 F22W Womens snowboard boots Sz75 New in original box $62.50 Time Remaining: 6h 32m Buy It Now for only: $62.50

Oakley Womens Checked Out Snowboard Pants White $100.00 Time Remaining: 6h 33m Buy It Now for only: $100.00