So you would just go to mod.learntomod.com/programs and select multiplayer, then type the new name of your file.
A lot of the multiplayer blocks look similiar or even the same as the singleplayer blocks.
The do function when block is located under the minecraft < events tab - attach a 'player interact' block also in the minecraft < events tab.The black function block is located under the misc tab. The purple function blocks are located under the functions tab (be sure not to get the one with return at the end)
Variables are under the variables tab, cake is under the minecraft < materials tab. import is under the misc tab.
Under the minecraft < players tab, the blocks you'll need are the 'change texture pack' block, the 'change armour piece' (you'll need to place 4 of those in your mod, a helmet, a chestplate, legs and boots)
Under the items tab, you can use the 'new item of material' block which you can use with a variable. and an amount (number from the math tab)
For each item, you can paint it in the texture editor if you want it to look different. Then you'll add 3 texture pack blocks to your mod (one each for the hoe, the armour, the sword). Each texture block will have a different file name.
Hope this makes sense!