3d decoupage does not need a lot of equipment. What equipment you do need can be found here. From silicone glue to foam pads and more.

3d Decoupage Wooden Shaping Tool Wooden tool for shaping 3d decoupage. £2.50	400 2.4mm Double Sided Adhesive Foam Pads 400 double sided adhesive foam pads for 3d decoupage and all paper crafts. £1.15
5 Oblong 3" x 8" Shaker Cards 5 3" x 8" oblong shaker cards for making shaker or 3d decoupage cards £2.79	5 Oval 4" x 6" Shaker Cards 5 4" x 6" oval shaker cards for making shaker or 3d decoupage cards £2.79
5 Oval 5" x 7" Shaker Cards 5 5" x 7" oval shaker cards for making shaker or 3d decoupage cards £2.79	5 Rectangle 4" x 6" Shaker Cards 5 4" x 6" rectangle shaker cards for making shaker or 3d decoupage cards £2.79
5 Rectangle 5" x 7" Shaker Cards 5 5" x 7" rectangle shaker cards for making shaker or 3d decoupage cards £2.79	5 Square 5" x 5" Shaker Cards 5 5" x 5" square shaker cards for making shaker or 3d decoupage cards £2.79