What materials are you planning on using? Some general tips:
- Plan ahead. Regardless of materials, building in layers is key. You want to determing the base shape and thickness and then layer on detail from there. If you will be resin molding you will also need to consider how many pieces you will have.
- Bondo and sandable Primer with Filler are your best friends. The hardest part of a project for me is finishing it. By then you can see it coming together and it's easy to rush espically since you cant do anything between bondo coats. but quality finishing can make a HUGE difference in the end quality. Dont settle, if you dont like the way it looks in primer it may need more bondo and sanding.
- Hand Sand. While belt sanders and dremels are great for large strokes I still find hand sanding to be the only way to get that final finish.
- Buy a dremel. While it may not always be the most efficient tool it is the most versatile and there is very little it can't do.
Lastly, do you have any specific questions?