Sergiyev Posad is described in most guide books about Moscow or the Golden Ring. The city is a popular daytrip destination from Moscow.
I still had both my Rough Guide and Lonely Planet guides about Moscow from my first trip to Russia in 2005.
Both include a little street map and list the main sights of the monastery as well as some practical information about transportation and restaurants.
If I had to buy only one guide book I would go for the Rough Guide, as it is slighly more detailed.
Rough Guide: http://www.roughguides.com/
Lonely Planet: http://www.lonelyplanet.com/
Clothing/Shoes/Weather Gear: I would recommend very sturdy shoes, with very good grip, as there is a lot of ice and also compacted snow which turns to ice. In November the temperatures are often below freezing so gloves, a hat and a thick coat are recommended. Note though that you should remove your hat before entering the churches.
Miscellaneous: Although you can't see it well in this picture, Miyuki is wearing her headscarf. This is de rigeur for visiting an Orthodox monastery or church. We purchased hers from the vendors outside for about eight dollars, but you could save some money by bringing your own. This is standard practice for the Russians who come to worship and women should not feel discriminated against for being asked to wear one. Ladies covering their hair is a simple sign of respect and humility in the church.