>>10576796Hold up bro, if you're completely new to Bricklink, I have some advice.
First, learn to use Bricklink's Wanted List system. This will save you a lot of time when ordering pieces. Since you seem to want some 2x2 slopes, pick one of the slope pieces you want to buy (it doesn't matter which store you pick it from at this point) to get to the catalog page for that piece and click the Add to Wanted List link (see pic). The dropdown menu next to the picture of the piece that says "NOT APPLICABLE" is a color list so you can specify which color(s) you want to include on your wanted list.
The benefit of having a Wanted List is that you can click on the "Classic" link near the top of your wanted list page, then choose "By Shop" to see a list of all the sellers that have parts on your want list, and which sellers have the broadest number of parts/ largest quantity of parts/ cheapest piece, etc. If you want to narrow it down, just make a new wanted list with only one piece on it and see how many sellers have that piece.
You can also set your preferences to only show sellers in your country/region. Otherwise you're just blindly searching around the site hoping to find a good deal.
>>10576822The ordering/shipping process is mostly automated. If you have less than the minimum required, the system will tell you so. When you get to the shipping info part of checkout, it will give you options to choose for shipping.