I skipped reading most the posts to say:
A monopod just helps you be more steady but needs you to hold it
A tripod doesn't need your support meaning you can get a better image and you can even get in the shot
Auto mode will work fine for snap shots ~(you could also use Program mode (P) which allows more flexibility than auto but is essentially the same)
Dont cheap out on support accessories, the last thing you need is your camera to fall and break because you bought a cheap strap / cheap support.
Unfortunatelly good security doesn't come cheap and tbh.. opteka are terrible I have a Super telephoto from them, it is rubbish (mirror lens).
If you want true security go manfrotto or other top brands
Just remember in photography, you get what you pay for.
All the best
Macro filters are rubbish i have a set tbh, they arent Terribly bad but they dont work well... its basically a magnifying glass
on your lens (~next to the glass) it should say a size, most likely 58mm, these filters will fit...