Hi and welcome to the forum. For views on appraisal, it is always good to post pictures of items. Box condition is crucial for sets and the tear and markings probably bring it down to 'fair' or at best 'good' condition. The items you have there always tend to be a fair few available at any time on ebay and you can get an idea of what people are trying to get by searching on the site. While I would say based on valuations here, the set would be worth around $300 to $400, people often list them for much higher on ebay. The average “Buy It Now or Best Offer” listing level for what you have is around $600 – no guarantee it would sell for that, but you might be lucky.

For the supplements if they are in top condition, the values here (which are based on monitoring sales) are around $115, $130 and $150 for Greyhawk, Blackmoor and Eldritch Wizardry respectively. That being said, the market for rare D&D collectibles has been soaring over the past few years and you could try for 30 to 50% more if listing them on ebay, so around $150, $200 and $250 respectively if they are in excellent condition. Two options if selling on ebay: set a buy it now price and accept offers – so start high and see what offers you get; or set a low starting price and let the market decide.

You can see examples of similar items sales by scrolling backwards through this thread “Rares Formerly on Ebay”  acaeum.com/forum/viewtopic.php?f=3& ... start=3582  

Other may have different advice, but that is my take.