also, what happens if I send satoshis to a wallet that is mining, will it ever go through?
To do that: go to the board where you want to post (eg.: Bitcoin Technical Support)
and click "new topic" at the right-hand side of the screen (at the top of the topic list).
Now, to answer your question:
[1] I suppose it's Bitcoin core, then '?' are transactions that has various issues, most of them are txns that already dropped from your mempool.
To "clear" it (you mean remove?), you can use "Abandon transaction" when you right-click the transaction in the 'Transactions' tab, you should be able to reuse the inputs that it's trying to spend.
[2] This doesn't make sense, if you send to an address that's used for mining reward, it will be sent "normally" and prioritization will be based from the fee rate just like any other transactions.
If you have further questions, include it in your thread.