There isn’t one way that is the “swiss army knife” of techniques or entities really, as they all have specialties. If you ask one to do things it’s not that great at, you might be disappointed. A little effort in getting to know them and suiting the person to the request goes a long way. I suppose you could do a general “good luck” spell, but then you’ll need to reply on your ability to make opportunities more.
I’d say go with a deity level entity like Odin or Hermes or Gaia, but even then each has it’s own ambience and leanings. Of course monotheistic religions have that down to an art, but I don’t really recommend their god, though Jesus is a decent sort imo.
Eh, again they’re individuals, they can be harsh if they thing you’ll listen better. Generally, treat them with respect and you get it back. But if you wanted to be molly coddled, they won’t pat you on the head and go “there there”… you’re best off going towards the RHP entities like Jesus.
You need some guts to work with these entities usually, and just their appearance alone can be scary, if that’s a problem, “demons” might not be your thing.
This is a skill and there no shortcuts, but it’s a skill anyone can learn if you put some effort in… do the work and it will come. You can get help from folks like Leraje and Paimon, but they can’t/won’t do it for you.
But what works fast for some people is a no go for others, you must find out what works for you though trial and error. Know yourself, first and foremost. It’s worth it, but nothing about this isn’t going to be hard work. If there was an easy and simple route, we’d all be doing it and you wouldn’t have to ask what it is.
Look up the “develop psychic/astral senses tutorial” for some free information, and check out he book recommendations for this, pick one, work it, every day.
Look up the Love tutorial collections post for this one. Pick an entity and go for it.
Ant’harratu. Hands down.
You and your higher self. Cultivate your own spirit.
So don’t use any… Use an Astral temple, or look up the “tool free magick” tutorial. Tools are optional.
I don’t understand this question. What do you wat us to enquire about? Or did you mean “serious responses”?
Anybody may respond as long as it doesn’t break the forum rules, which basically boil down to :don’t be a dick"… If you think a post breaks the rules, please use the flag system to alert a moderator for review.
However, telling people what they can’t say is against forum rules, so please avoid doing that, we ask you to respond to the content of a post, not it’s tone.
Here is a handy dandy post you should read, which has links to all of this, the collections of tutorials, the rules and the faq. 
You might save some time if you browse through this first.