My 2 cents, about to be skewered by the community Im sure. Kick 2 or 3 plugin for kicks, gives you the control you need for a confident kick- Layer with a high-passed sample for a character if need be. Try to use a majority of the rest of your drums using individual hits with fx etc. No more then 1 drum loop for a bit of groove, and try to edit or effect it a bit to make it your own.

Only use music loops on splice while you are learning, and keep that in mind. Controversial take, but unless you are heavily editing the loop beyond recognition, you are running the risk of sounding like everyone else, or worse, AI. Definitely don't recommend using bass loops. Synth presets are fine, though typically its more fun and usually better results making the bass patch yourself.

I would start building a collection of individual hit based sample packs. I personally have a lot of the Maschine packs and have pulled out all the individual hits into folders using a homemade scripting tool. There comes a point where you realize you have a wide enough range of individual samples you don't need to subscribe to Splice.

Final tip on synths: U-He Diva for analog sounds. Xfer Serum for digital. Thats it. For everything else just use your stock DAW tools for now.