There are no hard and fast rules for conversion, it can be as simple as an arm/head swap to something as complex as entirely rescuplting part of a model. For starting off, though, here are a few tips:
1) If it can be done with plastic, do it with plastic: Until you are very good with GS, try as much as you can to use or repurpose plastic/resin parts as they will look better. For starting out, if you do need to use GS, try and keep it as simple as possible. Ambition is great, but until you've got some experience and practice GS can look bad. Certainly do experiment with it, but practice before going for any GS work other than gap-filling and the like.
2) Vision is key: While there is a certain amount of fun to be had from just pulling out handful of bits from your bits box and seeing what happens, it's usually best to have an idea where you want to take the conversion. I find that doing a very rough sketch beforehand (and I'm talking stick-person level rough from a few angles) can help, as I can get a feel for the pose and what I'm going to need to cut/glue/sculpt. Having a plan is always a good idea, and furthermore, always check your pose is going to look good before gluing anything. Blu-tac is your friend here.
3) Inspiration: If you're struggling to find anything ideas-wise, then the best ways I've found to get going are to look at the gallery on here and just trawl through until I see something that inspires me, to look at some artwork for the game and base it off that, or just to think 'what would be really cool?' If you're not overly fussed about gaming with the pieces, you can do a lot more with the conversion, and among most gamers, Rule of Cool will take over anyway, so basically, if you like an idea, just go for it.
In terms of materials and equipment, I'd say that a good knife, clippers and a file or two are essential, and a sculpting tool is also handy if you're using GS. Having a set of tweezers for fiddly bits and a pen or pencil for planning stuff is also handy. You then need a bits box of some kind, preferably something you can group stuff by race/type/usefulness in (multi-tray toolboxes are great for this). GS is always handy, and possibly some liquid GS for gap-filling. Plasticard is a godsend really, you can do so much with it, so if you can get that it will come in handy. A couple of sheets of different thicknesses and some plastic rod would be a good starting point.
Hope that helps. Really, the best advice is just to go for it. Don't be deterred if stuff doesn't work, and remember that it's all just a bit of fun.
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