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You don't need a stir plate to start with or even an erlenmeyer (although if you ever buy an erlenmeyer, get at least a 5L IMO), just use a growler or glass gallon jug, use proper sanitary practices (boil your funnel, PBW and sanitize your glassware, limit air exposure) and you should do quite well. I just use the intermittent shaking method for calculations on yeast growth websites.
ETA: I should add that I also intermittently shake the starter when using that calculator
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Edit: So how do I do a starter, since I'm still kinda new to this?
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You don't need a stir plate to start with or even an erlenmeyer (although if you ever buy an erlenmeyer, get at least a 5L IMO), just use a growler or glass gallon jug, use proper sanitary practices (boil your funnel, PBW and sanitize your glassware, limit air exposure) and you should do quite well. I just use the intermittent shaking method for calculations on yeast growth websites.
ETA: I should add that I also intermittently shake the starter when using that calculator
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Skin's got it. A starter is really simple. Just some water and extra light DME boiled for about 10 - 15 minutes, allowed to cool, and poured into your vessel (growler, erlenmyer, hell I've even seen people use plastic pop bottles). Pitch your yeast into it, cover lightly with aluminum foil (or airlock if you prefer) and let it go for 24 hours or so. Make sure your sanitation is good just like brewing a full batch of beer. You can just let it sit, you can shake it every time you walk past, you can put it on a stir plate, or anything in between.
Some people will make multi-step starters where they make a starter, let it settle out in the refrigerator and decant. Then pitch the yeast from that starter into a new starter and so on. Some people like to make a starter, refrigerate it, and decant the excess wort prior to pitching. It's really all up to you, but I typically make single step starters and just pitch the whole thing without decanting.
If you go the stirplate and erlenmyer route, get at least a 5L erlenmyer. I bought the 2L and wish I had gone larger. Don't buy the professional quality stir plates. I have one of the cheap $40 ones in a black plastic box that holds a computer fan. You can even make the stirplate yourself from an old computer fan if you want.
If you use the Wyeast smack packs, I like to activate them and allow them to start for a few hours in the pack before adding them to the starter. For White Labs, I just allow it to come to room temp before adding to the starter. For dry yeast, I don't bother with a starter and just pitch and extra pack if needed.
Go on Youtube and watch some videos about starters. There are a few good ones out there. I think BrewingTV and Beer Geek Nation have some good ones.