$7,000/month is very high. Most do it on much less.
Start keeping track of what you spend now. You'll need to add some things and subtract some to get a good idea. If you're going to keep your present house or load your belongings into a storage unit then it can really add up. We sold it all and never regretted it. Most likely your food will remain the same. Full-timers aren't on vacation so you don't go to restaurants for every meal. You cook like you always did. What do you do for entertainment now? Will you be doing the same as you travel? There are lots of variances and it just depends how you want to live the lifestyle. However, you can do it much less than you have figured. Good luck!