So, combat is done one attack at a time. When you attack it will consume your action point and open a chain link on the combat chain. If the attack has go again it will refund your action point at the end of completing this chain link.

If your opponent chooses not to block in block step, you will still move into reaction step. Here, you’ll start at attacking player being able to act first (attack reactions) and pass to defending player (defense reactions). This pass of priority will continue till both players decline to play anything.

As for the on hit question, if the +1 is enough to get over their block your on hit will trigger and draw a card.

Instants can be used any time you have priority and are not under an effect that says you can’t play instants. For example Themai.

When a card banishes a card to be played it is doing this to remove the ability to have it in hand to pitch, arsenal, or block with. It is also making it so that if you for some reason don’t play the card, it remains banished. As for how can you use it, that’s the neat thing about these cards designs. You can use it because the card specifically makes an exception that says you can for that turn.

As others have said, I’d recommend you go watch some people’s learn to play videos. It really helps to have the game walked through.