Originally Posted by kramberry20
can i use the wort from a previous batch is what i should have said. In other words how long will my previous wort be viable if refrigerated or should I just get some extract and not worry about it. I havent had any problems with pitching straight from the packets and is it worth the risk of added contamination possibilities with making the starter yeast
Appropriate pitching rates and temperature control are the two biggest improvements in beer quality after sanitation...my opinion based on great advice here on HBT and from reading, etc. I'm sure others would offer different opinions.
If you have good sanitation practices, yeast starters are almost always a good idea. If I recall correctly, there is enough healthy yeast for a 1.048 beer in the Wyeastlab and White Labs containers. If your projected OG is above that you'll most definitely benefit from a yeast starter or from pitching more than one pack of yeast.
There are good posts on starters here, and I'd encourage you to use the Mr Malty pitching rate calculator.