Use the internet to research how SFX are recorded:

 1. Footsteps:

• For grassy footsteps use newspaper in a plastic grocery bag and softly tap the bag. 
• A wet sponge or rag with the right timing (heel / toes).
• Old cassette tape - unravel a few tapes and put the tape on different surfaces (carpet, stone etc) and walk on it. Also just rotating it between your hands.
• Record yourself banging a boot or a heavy shoe against a heater. You can use a pair of boots to simulate a walking pattern.
• Photocopier sounds are good for robotic hydraulics/footsteps.
• Lay a strip of carpet on top of some gravel, then pace over it to make a cool walking on snow effect.

2. Rain:

• Plastic bags, polythene etc.
• Salt dropping on tinfoil 

3. Punch:

• Rolled up newspapers being hit with a (soft wooden) stick are meant to be good for body and face hits.
• A regular old bull whip crack is good for those over-the-top Street Fighter type punches.
• Hitting real meat, use a baseball bat to hit leather jacket wrapped around baseball gloves, add breaking of chicken bones.

4. Seashore:

•  Pouring a fizzy drink onto tarmac or any floor is supposed to be very good for sea (used in Jaws) 

5. Vomiting

• Take a large bottle of salad dressing (chilled to make it more viscous) and a gallon juice bottle filled with water. Take the dressing (with the cap on and tip it quickly and hard for the stomach internal sound then in quick succession dump the water on whatever surface you want (sidewalk, toilet etc..) add a little "ughh" on top . You can even do a few heaves before dumping the water for added realism.