Can be confusing but I'll keep trying
Quel...etc is an interrogative adjective and needs a noun: quelles chaussures? -- what shoes?
Lequel...etc. has several different uses. It can be an interrogative pronoun, a relative pronoun and even a relative adjective. If we concentrate on its use as an interrogative pronoun, the difference to quel is that it refers to something already mentioned previously. It also implies a limited selection to choose from, whereas quel leaves the field wide open.
Tu as quelles chaussures? -- What shoes do you have?J'ai beaucoup de chaussures. Lesquelles? -- I have many shoes. Which ones?
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