OK I know a little bit about this topic, have done a few batches, bit of trial & error with some pretty good results. I am not a salesman or retailer anymore so this is not going to help my bank account, but if you follow what I have to say it might just help your beer. Some of you may have noticed that I rarely spruik advice on here, but this is an exception. I have had a gut-full of the crap band-aid cures that get sold off as the latest essential, must have brewing ingredient. polyclar, finnings, filters, they are all just crap. Chuck em in the bin & get some flavour & character back in the glass. Please feel free to put them on eBay, you only have to find somebody as gullable as you were the day you bought them!
Get a liquid yeast, Wyeast or White Labs it doesn't really matter. Pick out a good flocculator. This little animal is now your new best friend so be nice to him. Liquid yeast are great fun. Yeast propagation is like another hobby inside a hobby. I like to use a few different strains for lagers, but when brewing Ales at home I prefer the WLP005. If you are brewing Lagers the WLP838, is great. Good little floccer with little to no sulphur. (I don't have any experience with Wyeast so go ask a Wyeast retailer what they have that is similar) Oh & when you build a starter, use some AG wort, not that crappy DME, this yeast is your friend, you wouldn't want this yeast to think you are a tightarse on your first date!