First I would get in the habit of checking the sodium content on all the things you buy & avoid cooking with salt. I just omit the salt in most recipes. ( you can put it on the table for anyone that really wants to add it and you can add other things for flavor, like Mrs. Dash, onions or garlic. Also look for reduced sodium products, there are a lot out there!
Here are a couple things to watch out for:
*Most Frozen Meals
*All Fast Food
*Packaged Rice/Noodle Mixes- They can be OK if you dont add all the seasoning pkt.
*Canned soups- pretty much ALL canned food, I think the salt preserves it?
*Beef/Turkey Jerkey-You can find some low brands though
*Cottage Cheese- Not sure if they have a low sodium version but it is OK in small portions plus it has a ton of protien
*Lunch Meats & Cheeses
*Chips and Snack Mixes/Crackers
*Condiments-Salsa, BBQ, Sweet & Sour, Marinades, ect.
I think if you just make yourself aware of sodium the same way you would with calories or something you should be fine. And after some expirmenting... you will be cooking low sodium in no time
Hope this helps a little, GOOD LUCK.