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Yes, you need to use landscape fabric under your rubber mulch. Rubber mulch doesn’t decompose, so putting landscape fabric down can work as a barrier between your mulch and soil, preventing your mulch from mixing with your soil and leaching chemicals like aluminum, cadmium, and copper into it. Also, since weeds can occasionally get through rubber mulch, using landscape fabric as a second form of protection can increase its effectiveness. 

A good gravel driveway should be built in layers using different sizes of gravel. A solid base layer of larger crushed stone (around 1 to 6 inches in diameter) provides stability and helps with drainage. Some recommend a middle layer of medium-sized gravel (2 to 3 inches). For the top driving surface, smaller gravel is best. A common recommendation is to use gravel between 1/4 inch and 1 inch in diameter, as it compacts well to create an even surface that's easy to drive on. Avoid stones that are too large, flat, or round to ensure the best traction. Using different layers ensures the driveway is durable, drains properly, and doesn't shift over time.

Generally, it is not necessary to remove old mulch before applying a new layer. As organic mulch breaks down, it enriches the soil with nutrients. However, you should remove the old layer if it shows signs of fungus or disease, which can be common in moist areas, or if the total depth is already too thick. Avoid letting the total mulch depth exceed 3 inches, as this can harm plant roots. If you do remove old, disease-free mulch, it can be added to a compost pile.

If you’re using crushed stone or gravel as a base material, then yes, you should compact it to prevent movement of the top layers. For instance, if you don’t compact crushed stone or gravel and you lay pavers on top of them, the pavers will shift over time. However, if you’re using gravel or crushed stone as a top layer for aesthetic purposes, you might not want to compact the materials.